Weather forecast for: Grass Range MT
Last Update: 3:52 pm MDT Sep 18, 2026
Tonight: A slight chance of rain before midnight, then a chance of showers and thunderstorms between midnight and 3am, then showers likely and possibly a thunderstorm after 3am. Cloudy, with a low around 53. North northwest wind 6 to 10 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.
Saturday: Rain and possibly a thunderstorm before 1pm, then showers and possibly a thunderstorm, mainly after 1pm. High near 59. North wind 8 to 11 mph, with gusts as high as 20 mph. Chance of precipitation is 80%. New rainfall amounts between 1 and 2 inches possible.
Saturday Night: Rain. Low around 51. North wind 6 to 9 mph. Chance of precipitation is 80%. New precipitation amounts between a half and three quarters of an inch possible.
Sunday: Rain likely, mainly before noon. Cloudy, with a high near 63. North wind around 7 mph. Chance of precipitation is 70%.
Sunday Night: Mostly cloudy, with a low around 48. East wind 5 to 8 mph becoming south after midnight.
Monday: Mostly sunny, with a high near 74. South wind 5 to 11 mph, with gusts as high as 18 mph.
Monday Night: Mostly clear, with a low around 51. South southeast wind 8 to 13 mph becoming southwest after midnight. Winds could gust as high as 20 mph.
Tuesday: Mostly sunny, with a high near 79. West southwest wind around 6 mph becoming light and variable.
Tuesday Night: Partly cloudy, with a low around 54.
Wednesday: Sunny, with a high near 79.
Wednesday Night: Mostly clear, with a low around 54.
Thursday: Sunny, with a high near 80.
Thursday Night: Mostly clear, with a low around 55.
Friday: Mostly sunny, with a high near 81.
WeatherWorld.com
