Weather WorldUpper Mason Lake, MT 7-Day Weather Forecast
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Upper Mason Lake Weather Forecast
Upper Mason Lake, MT Weather Forecast Date: 1032 PM MDT Wed Oct 07 2026
Weather forecast for Upper Mason Lake, MT
Tonight Lo: 42°F Lo: 6°C |
Tonight... Mostly clear. Lows 38 to 44. West winds up to 10 mph. |
Thu Hi: 66°FHi: 19°C Lo: 43°F Lo: 6°C |
Thursday... Sunny. Highs 60 to 70. Southwest winds up to 10 mph. |
| Fri Hi: 66°FHi: 19°C Lo: 43°F Lo: 6°C |
Friday... Breezy, sunny. Highs 59 to 71. South winds 10 to 15 mph shifting to the southwest 15 to 25 mph in the afternoon. Gusts up to 55 mph. |
Sat Hi: 55°FHi: 13°C Lo: 27°F Lo: -3°C |
Saturday... Partly sunny. Chance of rain in the morning, then chance of rain and slight chance of snow in the afternoon. Highs 49 to 59. Chance of precipitation 50%. |
Sun Hi: 34°FHi: 1°C Lo: 25°F Lo: -4°C |
Sunday... Colder. Snow and rain in the morning, then snow and rain likely in the afternoon. Moderate snow accumulations. Highs 28 to 38. Chance of precipitation 90%. |
| Columbus Day Hi: 39°FHi: 4°C Lo: 27°F Lo: -3°C |
Columbus Day... Mostly cloudy. Chance of snow and rain likely in the morning, then chance of snow and rain in the afternoon. Light snow accumulations. Highs 33 to 43. Chance of precipitation 60%. |
| Tue Hi: 46°FHi: 8°C Lo: 31°F Lo: -1°C |
Tuesday... Mostly cloudy. A 40% chance of rain and snow. Lows 23 to 29. Highs 40 to 50. |
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