Weather forecast for: Westby MT
Last Update: 3:56 pm MDT Sep 13, 2026
Tonight: A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 4am. Low around 50. East southeast wind 15 to 18 mph, with gusts as high as 29 mph. Chance of precipitation is 80%.
Monday: Showers and thunderstorms before 2pm, then showers and possibly a thunderstorm, mainly after 2pm. High near 61. Windy, with a south southeast wind 14 to 24 mph becoming west 28 to 38 mph. Winds could gust as high as 49 mph. Chance of precipitation is 100%.
Monday Night: A 50 percent chance of showers before 8pm. Mostly cloudy, with a low around 43. Windy, with a west northwest wind 29 to 34 mph decreasing to 17 to 22 mph after midnight. Winds could gust as high as 45 mph.
Tuesday: Cloudy, then gradually becoming mostly sunny, with a high near 62. Northwest wind 7 to 16 mph, with gusts as high as 23 mph.
Tuesday Night: Mostly cloudy, with a low around 43. North wind 6 to 8 mph becoming east southeast after midnight.
Wednesday: A 30 percent chance of showers before noon. Partly sunny, with a high near 65. East wind 8 to 13 mph, with gusts as high as 20 mph.
Wednesday Night: Mostly clear, with a low around 41. East northeast wind 6 to 9 mph becoming south after midnight.
Thursday: Mostly sunny, with a high near 72. South wind 6 to 10 mph, with gusts as high as 18 mph.
Thursday Night: Mostly clear, with a low around 47. South southeast wind around 7 mph becoming east after midnight.
Friday: A 20 percent chance of showers after noon. Mostly sunny, with a high near 73. North northeast wind 7 to 10 mph.
Friday Night: A 30 percent chance of showers. Mostly cloudy, with a low around 46. Northeast wind 7 to 9 mph.
Saturday: A slight chance of showers. Mostly sunny, with a high near 71.
Saturday Night: A chance of showers. Partly cloudy, with a low around 47.
Sunday: A slight chance of showers. Partly sunny, with a high near 72.