Expires:202512100300;;278249 FPUS55 KBYZ 091344 ZFPBYZ Zone Forecast Product for South Central and Southeast Montana National Weather Service Billings MT 643 AM MST Tue Dec 9 2025 Spot temperatures and probabilities of measurable precipitation are for today, tonight, and Wednesday. MTZ029-100300- Musselshell- Including the city of Roundup 643 AM MST Tue Dec 9 2025 ...HIGH WIND WARNING IN EFFECT UNTIL 5 PM MST THIS AFTERNOON... .TODAY...Partly sunny. Isolated rain showers early in the morning, then scattered rain showers in the late morning and early afternoon. Windy. Highs in the lower 50s. Northwest winds 20 to 35 mph with gusts to around 50 mph. Chance of precipitation 30 percent. .TONIGHT...Mostly cloudy. A 20 percent chance of snow after 3 am. Colder. Lows in the upper 20s. Southwest winds 5 to 15 mph. .WEDNESDAY...Snow in the morning. Slight chance of rain late in the morning, then chance of rain showers in the afternoon. Snow accumulation an inch or less. Highs in the upper 40s. Southwest winds 5 to 15 mph. Chance of precipitation 90 percent. .WEDNESDAY NIGHT...Mostly cloudy with a 50 percent chance of rain showers. Lows in the mid 30s. West winds 5 to 15 mph. .THURSDAY...Chance of rain and snow showers in the morning, then rain and snow showers likely in the afternoon. Highs in the upper 40s. West winds 5 to 15 mph. Chance of precipitation 70 percent. .THURSDAY NIGHT...Snow in the evening, then snow likely overnight. Much colder. Accumulations possible. Lows around 4. Chance of precipitation 80 percent. .FRIDAY...Snow, cold. Snow may be heavy at times in the morning. Accumulations possible. Highs around 14. Chance of precipitation 80 percent. .FRIDAY NIGHT...Snow likely. Accumulations possible. Lows around 1. Chance of precipitation 60 percent. .SATURDAY...Cloudy with a 30 percent chance of snow in the morning, then partly sunny in the afternoon. Highs around 19. .SATURDAY NIGHT...Mostly cloudy. Lows around 5. .SUNDAY...Partly sunny. Warmer. Highs around 40. .SUNDAY NIGHT...Mostly cloudy. Warmer. Lows in the lower 20s. .MONDAY...Partly sunny. Highs in the lower 40s. $$