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Harrison, MT Weather Forecast
Harrison, MT Weather Forecast Date: 336 PM MDT Fri Sep 11 2026
The area/counties/county of: Missouri Headwaters, including the cities of: Harrison, Three Forks, Willow Creek, Pony, and Whitehall.or toggle through each period.
Tonight... Mostly cloudy. Patchy fog late in the night. Lows in the mid 40s. Northeast winds 10 to 15 mph shifting to the north after midnight. Gusts up to 30 mph.
Saturday... Mostly cloudy in the morning then becoming mostly sunny. Patchy fog in the morning. Highs in the upper 60s. Northeast winds up to 10 mph.
Saturday Night... Mostly cloudy. Lows in the lower 40s. Northeast winds up to 15 mph with gusts to around 30 mph.
Sunday... Mostly sunny. A 50% chance of rain in the afternoon. Highs around 70. East winds up to 5 mph shifting to the southwest with gusts to around 30 mph in the afternoon.
Sunday Night... Mostly cloudy with chance of rain in the evening, then partly cloudy with slight chance of rain after midnight. Lows in the lower 40s. West winds 5 to 15 mph. Gusts up to 35 mph in the evening. Chance of rain 40%.
Monday... Mostly sunny. Highs in the lower 60s.
Monday Night... Mostly clear. Lows in the upper 30s. Highs in the mid 60s.
Tuesday... Mostly clear. Lows in the upper 30s. Highs in the mid 60s.
Tuesday Night... Partly cloudy. Lows around 40. Highs in the mid 60s.
Wednesday... Partly cloudy. Lows around 40. Highs in the mid 60s.
Thursday... Sunny. Highs in the lower 70s.
Thursday Night... Mostly clear. A 20% chance of rain showers. Lows in the mid 40s. Highs in the mid 70s.
POP = Probability of Precipitation
Harrison Radar Loop
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