Weather forecast for: Roundup MT
Last Update: 5:52 am MDT Sep 6, 2026
Today: Patchy fog before 9am. Otherwise, partly sunny, with a high near 81. Light northeast wind increasing to 6 to 11 mph in the morning.
Tonight: Showers likely and possibly a thunderstorm before 3am, then a chance of showers and thunderstorms, mainly between 3am and 5am. Patchy fog after 3am. Otherwise, mostly cloudy, with a low around 56. Northeast wind 8 to 13 mph becoming west southwest after midnight. Chance of precipitation is 60%.
Labor Day: A slight chance of showers before noon, then a chance of showers and thunderstorms between noon and 3pm, then a chance of showers after 3pm. Patchy fog before 9am. Otherwise, mostly cloudy through mid morning, then becoming sunny, with a high near 78. West wind 6 to 11 mph increasing to 19 to 24 mph in the afternoon. Chance of precipitation is 30%.
Monday Night: Mostly clear, with a low around 49. West wind 17 to 24 mph.
Tuesday: Sunny, with a high near 72. West wind 17 to 21 mph.
Tuesday Night: Mostly clear, with a low around 43. Northwest wind 12 to 17 mph becoming light and variable after midnight.
Wednesday: Sunny, with a high near 81. Southwest wind 5 to 11 mph.
Wednesday Night: Mostly clear, with a low around 47. West northwest wind 5 to 9 mph becoming calm.
Thursday: Sunny, with a high near 85. West southwest wind 8 to 14 mph.
Thursday Night: Mostly clear, with a low around 50. Northwest wind 6 to 11 mph becoming light.
Friday: A 20 percent chance of showers. Mostly sunny, with a high near 76. West northwest wind 6 to 11 mph becoming north in the afternoon.
Friday Night: A 40 percent chance of showers. Mostly cloudy, with a low around 45. North wind 7 to 13 mph.
Saturday: A 30 percent chance of showers. Mostly cloudy, with a high near 66. North wind 8 to 10 mph.
WeatherWorld.com
City of Roundup, MT
