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Big Arm, MT Weather Forecast
Big Arm, MT Weather Forecast Date: 1222 AM MDT Sat Sep 05 2026
The area/counties/county of: Flathead/Mission Valleys, including the cities of: Kalispell, Polson, and St. Ignatius.or toggle through each period.
Today... Mostly cloudy. A 50% chance of areas of rain in the morning. Patchy fog early in the morning. Highs in the mid 60s to lower 70s.
Tonight... Slight chance of thunderstorms. Slight chance of rain showers in the evening, then rain showers likely after midnight. Chance of precipitation 70%. Lows in the mid 40s to lower 50s.
Sunday... Mostly cloudy. A chance of rain in the morning, then chance of rain showers and a slight chance of thunderstorms in the afternoon. Chance of precipitation 50%. Highs in the mid 60s to lower 70s.
Sunday Night... Rain showers likely and a slight chance of thunderstorms in the evening, then rain likely after midnight. Chance of precipitation 90%. Lows in the 40s to lower 50s.
Labor Day... Rain likely in the morning, then rain showers likely and a chance of thunderstorms in the afternoon. Chance of precipitation near 100%. Highs in the mid 50s to lower 60s.
Monday Night... Rain showers likely and a slight chance of thunderstorms in the evening, then rain likely after midnight. Chance of precipitation 90%. Lows in the upper 30s to mid 40s.
Tuesday... Mostly cloudy with a 40% chance of rain. Highs in the mid 60s to lower 70s.
Tuesday Night... Partly cloudy. Lows in the upper 30s to mid 40s.
Wednesday... Mostly sunny. Highs in the 70s.
Wednesday Night... Mostly clear. Lows in the 40s.
Thursday... Partly cloudy. Highs in the 70s.
Thursday Night... Partly cloudy. A 20% chance of rain after midnight. Lows in the 40s.
POP = Probability of Precipitation
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