Weather forecast for: Plains MT
Last Update: 2:00 am MDT Sep 17, 2026
Overnight: Mostly clear, with a low around 43. Calm wind.
Thursday: Mostly sunny, with a high near 81. Light and variable wind.
Thursday Night: A 40 percent chance of rain, mainly before 1am. Partly cloudy, with a low around 48. South southeast wind around 6 mph becoming calm after midnight.
Friday: A 20 percent chance of rain after 5pm. Partly sunny, with a high near 80. Calm wind becoming west northwest around 6 mph in the afternoon.
Friday Night: Mostly cloudy, with a low around 48. Calm wind.
Saturday: Sunny, with a high near 81.
Saturday Night: Mostly clear, with a low around 48.
Sunday: Sunny, with a high near 83.
Sunday Night: Clear, with a low around 48.
Monday: Sunny, with a high near 85.
Monday Night: Mostly clear, with a low around 48.
Tuesday: Sunny, with a high near 84.
Tuesday Night: Partly cloudy, with a low around 47.
Wednesday: Mostly sunny, with a high near 81.