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Flathead Lake, MT Weather Forecast
Flathead Lake, MT Weather Forecast Date: 1223 PM MDT Wed Sep 02 2026
The area/counties/county of: Flathead/Mission Valleys, including the cities of: Kalispell, Polson, and St. Ignatius.or toggle through each period.
Tonight... Partly cloudy with areas of rain in the evening, then mostly cloudy after midnight. Cloudy with areas of rain late in the night. Patchy fog after midnight. Chance of rain 50%. Lows in the 40s. Southwest winds to 15 mph.
Thursday... Rain likely in the morning, then slight chance of rain in the afternoon. Chance of rain 60%. Highs in the 60s.
Thursday Night... A chance of rain in the evening, then rain likely after midnight. Patchy fog after midnight. Chance of rain 70%. Lows in the upper 30s to mid 40s.
Friday... Mostly cloudy with a 50% chance of rain. Patchy fog in the morning. Highs in the 60s.
Friday Night... Mostly cloudy with a 50% chance of rain. Patchy fog after midnight. Lows in the upper 30s to mid 40s.
Saturday... Mostly cloudy with a 50% chance of rain. Patchy fog in the morning. Highs in the 60s.
Saturday Night... Partly cloudy with a chance of rain showers and a slight chance of thunderstorms in the evening, then mostly cloudy with a chance of rain after midnight. Chance of precipitation 30%. Lows in the upper 30s to mid 40s.
Sunday... Mostly cloudy. A 30% chance of rain in the morning. Highs in the mid 60s to lower 70s.
Sunday Night... Mostly cloudy with a 50% chance of rain. Lows in the 40s.
Labor Day... Rain likely in the morning, then rain showers likely and a chance of thunderstorms in the afternoon. Chance of precipitation 60%. Highs in the 60s.
Monday Night... Mostly cloudy with a 50% chance of rain. Lows in the upper 30s to mid 40s.
Tuesday... Mostly cloudy with a 40% chance of rain. Highs in the 60s.
Tuesday Night... Partly cloudy. Lows in the upper 30s to mid 40s.
POP = Probability of Precipitation
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