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Mason Lake, MT Weather Forecast
Mason Lake, MT Weather Forecast Date: 336 PM MDT Tue Oct 20 2026
The area/counties/county of: Gallatin And Madison County Mountains And Centennial Mountains, including the cities of: Big Sky, West Yellowstone, Targhee Pass, and Raynolds Pass.or toggle through each period.
Tonight... Mostly clear. Lows 33 to 39. Southeast winds up to 10 mph.
Wednesday... Sunny. Highs 50 to 60. South winds up to 10 mph increasing to 10 to 15 mph in the afternoon. Gusts up to 30 mph.
Wednesday Night... Mostly clear. Lows 35 to 41. South winds 5 to 10 mph with gusts to around 25 mph.
Thursday... Mostly sunny. Highs 51 to 61. South winds 5 to 15 mph. Gusts up to 25 mph increasing to 35 mph in the afternoon.
Thursday Night... Chance of rain in the evening, then rain after midnight. Lows 34 to 40. South winds 5 to 10 mph with gusts to around 25 mph. Chance of rain near 100%.
Friday... Colder. Rain showers and slight chance of thunderstorms in the morning, then rain showers, snow showers and slight chance of thunderstorms in the afternoon. Heavy snow accumulations. Highs 38 to 44. Chance of precipitation near 100%.
Friday Night... Colder. Mostly cloudy. Snow and rain in the evening, then slight chance of snow after midnight. Moderate snow accumulations. Lows in the mid 20s. Chance of precipitation 90%.
Saturday... Partly cloudy. Highs 34 to 48. Lows in the mid 20s.
Sunday... Partly cloudy. Highs 34 to 48. Lows in the mid 20s.
Monday... Partly cloudy. Highs 34 to 48. Lows in the mid 20s.
Monday Night... Partly cloudy with a 20% chance of snow. Lows in the upper 20s.
POP = Probability of Precipitation
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