Weather forecast for: Big Arm MT
Last Update: 2:01 am MDT Sep 5, 2026
Overnight: A 30 percent chance of rain, mainly after 5am. Cloudy, with a low around 49. Calm wind.
Saturday: A 50 percent chance of rain before 10am. Cloudy, then gradually becoming mostly sunny, with a high near 68. Light north wind. New precipitation amounts of less than a tenth of an inch possible.
Saturday Night: Showers and thunderstorms likely before 3am, then rain likely, mainly between 3am and 4am. Increasing clouds, with a low around 52. Light and variable wind. Chance of precipitation is 70%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Sunday: A chance of rain and thunderstorms before 4pm, then a slight chance of showers and thunderstorms between 4pm and 5pm. Mostly cloudy, with a high near 68. Light and variable wind. Chance of precipitation is 40%.
Sunday Night: Showers and possibly a thunderstorm before 9pm, then rain after 9pm. Low around 52. Light north wind. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.
Labor Day: Rain before noon, then showers and possibly a thunderstorm after noon. High near 60. Chance of precipitation is 100%. New rainfall amounts between three quarters and one inch possible.
Monday Night: Rain. Low around 48. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.
Tuesday: A chance of rain before noon. Partly sunny, with a high near 66.
Tuesday Night: Partly cloudy, with a low around 49.
Wednesday: Sunny, with a high near 72.
Wednesday Night: Mostly clear, with a low around 51.
Thursday: Mostly sunny, with a high near 74.
Thursday Night: A slight chance of rain. Partly cloudy, with a low around 53.
Friday: A slight chance of rain. Partly sunny, with a high near 70.
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About Big Arm, Montana
