Subj : Southern Ontario Weather To : All From : Northern Realms Date : Sat May 10 2025 15:35:00 FPCN11 CWTO 101930 Forecasts for Southern Ontario and the National Capital Region issued by Environment Canada at 3:30 p.m. EDT Saturday 10 May 2025 for tonight Sunday and Sunday night. The next scheduled forecast will be issued at 5:00 a.m. EDT Sunday. City of Toronto. Tonight..Clear. Wind west 20 km/h becoming north 30 gusting to 50 this evening. Low plus 4. Sunday..Sunny. Wind northeast 20 km/h becoming light in the morning. High 14. UV index 7 or high. Sunday night..Clear. Low plus 5. Windsor - Leamington - Essex County. Tonight..Clear. Wind northwest 20 km/h becoming northeast 20 gusting to 40 this evening. Low plus 5. Sunday..Sunny. Wind northeast 20 km/h becoming light late in the morning. High 20. UV index 8 or very high. Sunday night..Clear. Low 8. Chatham-Kent - Rondeau Park. Tonight..Clearing early this evening. Wind becoming north 20 km/h gusting to 40 this evening then light after midnight. Low plus 5. Sunday..Sunny. Wind becoming east 20 km/h gusting to 40 in the morning. High 20. UV index 8 or very high. Sunday night..Clear. Low 8. Sarnia - Petrolia - Western Lambton County. Tonight..Partly cloudy. Becoming clear this evening. Wind north 30 km/h. Low plus 4. Sunday..Sunny. High 18 except 12 near Lake Huron. UV index 8 or very high. Sunday night..Clear. Low 6. Watford - Pinery Park - Eastern Lambton County. Tonight..Clear. Wind west 20 km/h becoming light this evening. Wind becoming northeast 20 gusting to 40 late this evening. Low plus 3 with risk of frost. Sunday..Sunny. Wind northeast 20 km/h gusting to 40 becoming light late in the morning. High 20 except 12 near Lake Huron. UV index 8 or very high. Sunday night..Clear. Low plus 5. Rodney - Shedden - Western Elgin County. Tonight..Clear. Wind northwest 30 km/h becoming light late this evening. Low plus 4. Sunday..Sunny. Wind becoming east 20 km/h gusting to 40 then light late in the morning. High 20. UV index 8 or very high. Sunday night..Clear. Low 7. St. Thomas - Aylmer - Eastern Elgin County. Tonight..Clear. Wind northwest 30 km/h becoming light this evening. Wind becoming northeast 20 before morning. Low plus 4. Sunday..Sunny. Wind east 20 km/h gusting to 40 becoming light late in the morning. High 20. UV index 8 or very high. Sunday night..Clear. Low 7. Strathroy - Komoka - Western Middlesex County. Tonight..Clear. Wind north 20 km/h becoming light late this evening. Low plus 3 with risk of frost. Sunday..Sunny. Wind east 20 km/h becoming light late in the morning. High 20. UV index 8 or very high. Sunday night..Clear. Low 6. London - Parkhill - Eastern Middlesex County. Tonight..Clear. Wind becoming east 20 km/h before morning. Low plus 3 with risk of frost. Sunday..Sunny. Wind east 20 km/h becoming light late in the morning. High 20. UV index 8 or very high. Sunday night..Clear. Low 6. Simcoe - Delhi - Norfolk. Tonight..Clear. Wind becoming northeast 20 km/h gusting to 40 before morning. Low plus 4. Sunday..Sunny. Wind northeast 20 km/h gusting to 40 becoming light in the afternoon. High 18. UV index 8 or very high. Sunday night..Clear. Low plus 4. Dunnville - Caledonia - Haldimand. Tonight..Clear. Wind northwest 20 km/h becoming light this evening. Wind becoming northeast 20 gusting to 40 before morning. Low plus 4. Sunday..Sunny. Wind northeast 20 km/h gusting to 40 becoming light in the afternoon. High 16. UV index 8 or very high. Sunday night..Clear. Low plus 5. Woodstock - Tillsonburg - Oxford County. Tonight..Clear. Wind west 20 km/h becoming north 20 this evening. Low plus 3 with risk of frost. Sunday..Sunny. Wind east 20 km/h becoming light in the afternoon. High 18. UV index 8 or very high. Sunday night..Clear. Low plus 4. Brantford - County of Brant. Tonight..Clear. Wind west 20 km/h becoming northeast 20 after midnight. Low plus 4. Sunday..Sunny. Wind northeast 20 km/h gusting to 40 becoming light late in the morning. High 18. UV index 8 or very high. Sunday night..Clear. Low plus 3 with risk of frost. Niagara Falls - Welland - Southern Niagara Region. Tonight..Clear. Wind southwest 20 km/h becoming northeast 20 late this evening. Low 6. Sunday..Sunny. Wind northeast 20 km/h becoming light in the afternoon. High 15. UV index 8 or very high. Sunday night..Clear. Low 8. St. Catharines - Grimsby - Northern Niagara Region. Tonight..Clear. Wind becoming northeast 20 km/h before morning. Low 6. Sunday..Sunny. Wind northeast 20 km/h becoming light late in the morning. High 14. UV index 7 or high. Sunday night..Clear. Low plus 5. City of Hamilton. Tonight..Clear. Wind becoming northeast 20 km/h gusting to 40 late this evening. Low plus 4 with risk of frost. Sunday..Sunny. Wind northeast 20 km/h gusting to 40 becoming light in the afternoon. High 13. UV index 8 or very high. Sunday night..Clear. Low plus 4 with temperature rising to 10 by morning. Burlington - Oakville. Tonight..Clear. Wind becoming north 20 km/h gusting to 40 this evening. Low plus 4. Sunday..Sunny. Wind east 20 km/h becoming light late in the morning. High 11. UV index 7 or high. Sunday night..Clear. Low plus 5. Halton Hills - Milton. Tonight..Clear. Wind north 20 km/h. Low plus 3 with risk of frost. Sunday..Sunny. Wind east 20 km/h becoming light late in the morning. High 17. UV index 7 or high. Sunday night..Clear. Low plus 3 with risk of frost. Mississauga - Brampton. Tonight..Clear. Wind west 20 km/h becoming north 20 gusting to 40 this evening then light after midnight. Low plus 3 with risk of frost. Sunday..Sunny. High 15. UV index 7 or high. Sunday night..Clear. Low plus 4. Caledon. Tonight..Clear. Wind north 20 km/h gusting to 40. Low plus 1 with risk of frost. Sunday..Sunny. High 17. UV index 7 or high. Sunday night..Clear. Low plus 3 with risk of frost. Vaughan - Richmond Hill - Markham. Tonight..Clear. Wind becoming north 20 km/h gusting to 40 early this evening. Low plus 3 with risk of frost. Sunday..Sunny. High 16. UV index 7 or high. Sunday night..Clear. Low plus 4. Newmarket - Georgina - Northern York Region. Tonight..Clear. Wind northwest 20 km/h becoming light after midnight. Low plus 1 with patchy frost. Sunday..Sunny. High 18. UV index 7 or high. Sunday night..Clear. Low plus 3 with risk of frost. Pickering - Oshawa - Southern Durham Region. Tonight..Clear. Wind west 20 km/h becoming north 20 gusting to 40 this evening. Low plus 3 with risk of frost. Sunday..Sunny. High 14. UV index 7 or high. Sunday night..Clear. Low plus 4. Uxbridge - Beaverton - Northern Durham Region. Tonight..Clear. Wind north 20 km/h gusting to 40. Low plus 1 with patchy frost. Sunday..Sunny. High 18. UV index 7 or high. Sunday night..Clear. Low plus 3 with risk of frost. Goderich - Bluewater - Southern Huron County. Tonight..Clear. Wind west 20 km/h becoming north 20 this evening. Low plus 2 with risk of frost. Sunday..Sunny. Wind southeast 20 km/h becoming light late in the morning. High 20. UV index 7 or high. Sunday night..Clear. Low plus 5. Wingham - Blyth - Northern Huron County. Tonight..Clear. Wind north 20 km/h becoming light this evening. Low plus 2 with risk of frost. Sunday..Sunny. High 20. UV index 7 or high. Sunday night..Clear. Low plus 5. Stratford - Mitchell - Southern Perth County. Tonight..Partly cloudy. Becoming clear this evening. Wind north 20 km/h becoming light after midnight. Low plus 1 with patchy frost. Sunday..Sunny. Wind becoming east 20 km/h gusting to 40 in the morning then light in the afternoon. High 20. UV index 7 or high. Sunday night..Clear. Low plus 5. Listowel - Milverton - Northern Perth County. Tonight..Clear. Wind northwest 20 km/h becoming northeast 20 late this evening. Low plus 1 with patchy frost. Sunday..Sunny. Wind east 20 km/h becoming light late in the morning. High 20. UV index 7 or high. Sunday night..Clear. Low plus 5. Kitchener - Cambridge - Region of Waterloo. Tonight..Clear. Wind north 20 km/h gusting to 40 becoming light after midnight. Wind becoming northeast 20 before morning. Low plus 1 with patchy frost. Sunday..Sunny. Wind northeast 20 km/h becoming southeast 20 late in the morning. High 18. UV index 7 or high. Sunday night..Clear. Low plus 3 with risk of frost. Guelph - Erin - Southern Wellington County. Tonight..Clear. Wind north 20 km/h. Low plus 1 with patchy frost. Sunday..Sunny. Wind east 20 km/h becoming light late in the morning. High 18. UV index 7 or high. Sunday night..Clear. Low plus 3 with risk of frost. Mount Forest - Arthur - Northern Wellington County. Tonight..Clear. Wind becoming north 20 km/h this evening. Low plus 1. Sunday..Sunny. Wind east 20 km/h becoming light late in the morning. High 18. UV index 7 or high. Sunday night..Clear. Low plus 4. Orangeville - Grand Valley - Southern Dufferin County. Tonight..Clear. Wind becoming north 20 km/h gusting to 40 this evening. Low plus 1. Sunday..Sunny. High 18. UV index 7 or high. Sunday night..Clear. Low plus 4. Shelburne - Mansfield - Northern Dufferin County. Tonight..Clear. Wind northwest 20 km/h gusting to 40 becoming northeast 20 gusting to 40 late this evening. Low plus 1. Sunday..Sunny. Wind east 20 km/h becoming light late in the morning. High 18. UV index 7 or high. Sunday night..Clear. Low plus 5. Innisfil - New Tecumseth - Angus. Tonight..Clear. Wind northwest 20 km/h becoming light late this evening. Low plus 2. Sunday..Sunny. High 19. UV index 7 or high. Sunday night..Clear. Low plus 3. Saugeen Shores - Kincardine - Southern Bruce County. Tonight..Clear. Wind north 30 km/h becoming light this evening. Low plus 1. Sunday..Sunny. Wind east 20 km/h becoming light late in the morning. High 16. UV index 7 or high. Sunday night..Clear. Wind becoming south 20 km/h near midnight. Low 6. Bruce Peninsula - Sauble Beach - Tobermory. Tonight..Clear. Wind northwest 20 km/h becoming light this evening. Low plus 1. Sunday..Sunny. Wind becoming east 20 km/h late in the morning. High 13. UV index 7 or high. Sunday night..Clear. Wind becoming south 20 km/h near midnight. Low 6. Hanover - Dundalk - Southern Grey County. Tonight..Clear. Wind north 20 km/h becoming light after midnight. Low plus 1. Sunday..Sunny. Wind east 20 km/h becoming light late in the morning. High 20. UV index 7 or high. Sunday night..Clear. Low 6. Owen Sound - Blue Mountains - Northern Grey County. Tonight..Clear. Wind northwest 20 km/h becoming northeast 20 this evening. Low plus 3. Sunday..Sunny. Wind east 20 km/h becoming light late in the morning. High 16. UV index 7 or high. Sunday night..Clear. Low 6. Barrie - Collingwood - Hillsdale. Tonight..Clear. Wind north 20 km/h gusting to 40 becoming light after midnight. Low plus 2. Sunday..Sunny. Wind becoming south 20 km/h late in the afternoon. High 18. UV index 7 or high. Sunday night..Clear. Low plus 4. Midland - Coldwater - Orr Lake. Tonight..Clear. Wind north 30 km/h gusting to 50 becoming light after midnight. Low plus 3. Sunday..Sunny. Wind becoming southeast 20 km/h late in the morning. High 15. UV index 7 or high. Sunday night..Clear. Low 6. Orillia - Lagoon City - Washago. Tonight..Clear. Wind northwest 30 km/h. Low plus 3. Sunday..Sunny. High 15. UV index 7 or high. Sunday night..Clear. Low plus 5. Cobourg - Colborne - Western Northumberland County. Tonight..Clear. Wind becoming north 30 km/h this evening. Low plus 3 with risk of frost. Sunday..Sunny. Wind northeast 20 km/h becoming light late in the morning. High 17. UV index 7 or high. Sunday night..Clear. Low plus 4. Belleville - Quinte West - Eastern Northumberland County. Tonight..Clear. Wind becoming north 30 km/h this evening. Low plus 3 with risk of frost. Sunday..Sunny. Wind northeast 20 km/h becoming light late in the morning. High 17. UV index 7 or high. Sunday night..Clear. Low plus 4. Picton - Sandbanks Park. Tonight..Clear. Wind west 20 km/h becoming north 30 this evening. Low plus 5. Sunday..Sunny. Wind northeast 20 km/h becoming light late in the morning. High 17. UV index 7 or high. Sunday night..Clear. Low plus 5. Napanee - Consecon. Tonight..Clear. Wind becoming north 30 km/h this evening. Low plus 3 with risk of frost. Sunday..Sunny. Wind northeast 20 km/h becoming light late in the morning. High 17. UV index 7 or high. Sunday night..Clear. Low plus 4. Kingston - Odessa - Frontenac Islands. Tonight..Partly cloudy. Becoming clear this evening. Wind southwest 20 km/h becoming north 30 gusting to 50 this evening. Low plus 3 with risk of frost. Sunday..Sunny. Wind northeast 20 km/h gusting to 40 becoming light late in the morning. High 16. UV index 7 or high. Sunday night..Clear. Low plus 4. Lindsay - Southern Kawartha Lakes. Tonight..Clear. Wind northwest 20 km/h gusting to 40 becoming light after midnight. Low plus 1. Sunday..Sunny. Wind east 20 km/h becoming light late in the morning. High 18. UV index 7 or high. Sunday night..Clear. Low plus 3. Fenelon Falls - Balsam Lake Park - Northern Kawartha Lakes. Tonight..Clear. Wind west 30 km/h becoming north 20 gusting to 40 early this evening then light after midnight. Low plus 1. Sunday..Sunny. High 18. UV index 7 or high. Sunday night..Clear. Low plus 3. Peterborough City - Lakefield - Southern Peterborough County. Tonight..Clear. Wind north 20 km/h gusting to 40. Low plus 1. Sunday..Sunny. High 18. UV index 7 or high. Sunday night..Clear. Low plus 3. Apsley - Woodview - Northern Peterborough County. Tonight..Clear. Wind north 30 km/h gusting to 50. Low zero. Sunday..Sunny. Wind northeast 20 km/h becoming light in the morning. High 18. UV index 7 or high. Sunday night..Clear. Low plus 3. Stirling - Tweed - Madoc. Tonight..Clear. Wind north 30 km/h gusting to 50. Low plus 2 with patchy frost. Sunday..Sunny. Wind northeast 20 km/h becoming light late in the morning. High 18. UV index 7 or high. Sunday night..Clear. Low plus 3 with risk of frost. Tamworth - Sydenham - South Frontenac. Tonight..Clear. Wind north 30 km/h gusting to 50. Low plus 2 with patchy frost. Sunday..Sunny. Wind northeast 20 km/h becoming light late in the morning. High 18. UV index 7 or high. Sunday night..Clear. Low plus 3 with risk of frost. Kaladar - Bannockburn - Bon Echo Park. Tonight..Clear. Wind north 20 km/h gusting to 40. Low zero. Sunday..Sunny. Wind northeast 20 km/h becoming light late in the morning. High 17. UV index 7 or high. Sunday night..Clear. Low plus 3. Bancroft - Hastings Highlands - Denbigh. Tonight..Clear. Wind becoming north 20 km/h gusting to 40 this evening. Low minus 3. Wind chill minus 9 overnight. Sunday..Sunny. Wind northeast 20 km/h becoming light late in the morning. High 17. UV index 7 or high. Sunday night..Clear. Low plus 3. Gananoque - Mallorytown. Tonight..A few clouds. Wind north 30 km/h gusting to 50. Low plus 3 with risk of frost. Sunday..Sunny. Wind northeast 20 km/h becoming light late in the morning. High 17. UV index 7 or high. Sunday night..Clear. Low plus 4. Brockville - Prescott. Tonight..Clear. Wind becoming north 30 km/h gusting to 50 this evening. Low plus 2 with risk of frost. Sunday..Sunny. Wind northeast 20 km/h becoming light late in the morning. High 17. UV index 7 or high. Sunday night..Clear. Low plus 4. Westport - Charleston Lake. Tonight..Clear. Wind north 30 km/h gusting to 50. Low plus 2 with patchy frost. Sunday..Sunny. Wind north 20 km/h gusting to 40 becoming light late in the morning. High 17. UV index 7 or high. Sunday night..Clear. Low plus 4. Merrickville-Wolford - Kemptville. Tonight..Clear. Wind northwest 30 km/h gusting to 50 becoming light after midnight. Wind becoming north 20 before morning. Low plus 1 with patchy frost. Sunday..Sunny. Wind north 20 km/h becoming light late in the morning. High 17. UV index 7 or high. Sunday night..Clear. Low plus 4. Ottawa North - Kanata - Orl‚ans. Tonight..Partly cloudy. Becoming clear this evening. Wind northwest 30 km/h gusting to 50 becoming light after midnight. Wind becoming north 20 before morning. Low plus 1 with patchy frost. Sunday..Sunny. Wind north 20 km/h becoming light late in the morning. High 17. UV index 6 or high. Sunday night..Clear. Becoming partly cloudy near midnight. Low 6. Ottawa South - Richmond - Metcalfe. Tonight..Clear. Wind northwest 30 km/h gusting to 50 becoming light after midnight. Wind becoming north 20 before morning. Low plus 1 with patchy frost. Sunday..Sunny. Wind north 20 km/h becoming light late in the morning. High 17. UV index 6 or high. Sunday night..Clear. Becoming partly cloudy near midnight. Low plus 5. Gatineau. Tonight..Partly cloudy. Becoming clear this evening. Wind becoming northwest 30 km/h gusting to 50 this evening. Low plus 1 with patchy frost. Sunday..Sunny. Wind northwest 20 km/h becoming light late in the morning. High 17. UV index 6 or high. Sunday night..Clear. Becoming partly cloudy near midnight. Low plus 5. Prescott and Russell. Tonight..Clear. Wind northwest 30 km/h gusting to 50 becoming light after midnight. Wind becoming north 20 before morning. Low plus 1 with patchy frost. Sunday..Sunny. Wind northwest 20 km/h becoming light late in the morning. High 16. UV index 6 or high. Sunday night..Clear. Becoming partly cloudy near midnight. Low plus 5. Morrisburg - Long Sault. Tonight..Clear. Wind northwest 30 km/h gusting to 60 becoming light after midnight. Wind becoming north 20 before morning. Low plus 1 with patchy frost. Sunday..Sunny. Wind north 20 km/h becoming light late in the morning. High 17. UV index 7 or high. Sunday night..A few clouds. Low plus 5. Cornwall - Lancaster. Tonight..Clearing early this evening. Wind becoming northwest 20 km/h gusting to 40 this evening then light after midnight. Low plus 1 with patchy frost. Sunday..Sunny. High 16. UV index 7 or high. Sunday night..A few clouds. Low plus 5. Winchester - Newington. Tonight..Clear. Wind northwest 30 km/h gusting to 50 becoming light after midnight. Wind becoming north 20 before morning. Low plus 1 with patchy frost. Sunday..Sunny. Wind north 20 km/h becoming light late in the morning. High 17. UV index 7 or high. Sunday night..A few clouds. Low plus 5. Maxville - Alexandria. Tonight..Clear. Wind northwest 30 km/h gusting to 50 becoming light after midnight. Low plus 1 with patchy frost. Sunday..Sunny. Wind northwest 20 km/h becoming light late in the morning. High 16. UV index 7 or high. Sunday night..A few clouds. Low plus 5. Plevna - Sharbot Lake - Western Lanark County. Tonight..Clear. Wind north 30 km/h gusting to 50. Low plus 1 with patchy frost. Sunday..Sunny. Wind northeast 20 km/h becoming light late in the morning. High 17. UV index 7 or high. Sunday night..Clear. Low plus 4. Smiths Falls - Perth - Eastern Lanark County. Tonight..Clear. Wind north 30 km/h gusting to 50. Low plus 1 with patchy frost. Sunday..Sunny. Wind north 20 km/h becoming light late in the morning. High 17. UV index 7 or high. Sunday night..Clear. Low plus 4. Port Carling - Port Severn. Tonight..Clear. Wind west 20 km/h becoming north 20 early this evening. Low plus 3. Sunday..Sunny. Wind becoming southeast 20 km/h in the afternoon. High 17. UV index 7 or high. Sunday night..Clear. Low 6. Bracebridge - Gravenhurst. Tonight..Clear. Wind north 20 km/h becoming light after midnight. Low zero. Sunday..Sunny. High 18. UV index 7 or high. Sunday night..Clear. Low plus 4. Town of Parry Sound - Rosseau - Killbear Park. Tonight..Clear. Wind becoming north 30 km/h this evening then light late this evening. Low zero. Sunday..Sunny. High 18. UV index 7 or high. Sunday night..Clear. Low plus 4. Huntsville - Baysville. Tonight..Clear. Wind north 20 km/h becoming light late this evening. Low minus 2. Sunday..Sunny. Wind southeast 20 km/h becoming light late in the morning. High 18. UV index 7 or high. Sunday night..Clear. Low plus 4. Haliburton - Minden - Southern Haliburton County. Tonight..Clear. Wind north 20 km/h gusting to 40 becoming light after midnight. Wind becoming northeast 20 before morning. Low minus 1. Sunday..Sunny. Wind east 20 km/h becoming light late in the morning. High 17. UV index 7 or high. Sunday night..Clear. Low plus 3. Oxtongue Lake - Fort Irwin - Northern Haliburton County. Tonight..Clear. Wind north 30 km/h becoming light after midnight. Wind becoming northeast 20 before morning. Low minus 3. Wind chill minus 9 overnight. Sunday..Sunny. Wind east 20 km/h becoming light late in the morning. High 17. UV index 7 or high. Sunday night..Clear. Low plus 3. Barry's Bay - Killaloe. Tonight..Clear. Wind north 20 km/h gusting to 40 becoming light late this evening. Low minus 1. Sunday..Sunny. Wind northeast 20 km/h becoming light late in the morning. High 17. UV index 7 or high. Sunday night..Clear. Low plus 5. Renfrew - Arnprior - Calabogie. Tonight..Clear. Wind north 20 km/h gusting to 40 becoming light after midnight. Low zero. Sunday..Sunny. High 17. UV index 7 or high. Sunday night..Clear. Low plus 5. Petawawa - Pembroke - Cobden. Tonight..Clear. Wind north 30 km/h gusting to 50 becoming light late this evening. Low minus 1. Sunday..Sunny. High 17. UV index 7 or high. Sunday night..Clear. Low plus 5. Western Algonquin Park - Lake of Two Rivers. Tonight..Partly cloudy. Becoming clear this evening. Wind north 20 km/h gusting to 40 becoming light late this evening. Low minus 5. Wind chill minus 9 overnight. Sunday..Sunny. Wind northeast 20 km/h becoming light late in the morning. High 17. Wind chill minus 7 in the morning. UV index 7 or high. Sunday night..Clear. Low 6. Deep River - Whitney - Eastern Algonquin Park. Tonight..Clear. Wind becoming north 20 km/h gusting to 40 this evening then light late this evening. Low minus 5. Wind chill minus 9 overnight. Sunday..Sunny. Wind northeast 20 km/h becoming light late in the morning. High 17. Wind chill minus 7 in the morning. UV index 7 or high. Sunday night..Clear. Low 6. Bayfield Inlet - Dunchurch. Tonight..Clear. Wind north 20 km/h gusting to 40 becoming light late this evening. Low zero. Sunday..Sunny. Wind east 20 km/h becoming light late in the morning. High 18. UV index 7 or high. Sunday night..Clear. Low plus 5. South River - Burk's Falls. Tonight..Partly cloudy. Becoming clear this evening. Wind north 20 km/h gusting to 40 becoming light late this evening. Low minus 2. Sunday..Sunny. Wind east 20 km/h becoming light late in the morning. High 18. UV index 7 or high. Sunday night..Clear. Low plus 5. End $$$$^^ --- up 3 days, 23 hours, 41 minutes * Origin: Northern Realms (1:229/664) .