Weather WorldGrassy Lake, MT 7-Day Weather Forecast
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Grassy Lake Weather Forecast
Grassy Lake, MT Weather Forecast Date: 337 PM MDT Fri Aug 14 2026
Weather forecast for Grassy Lake, MT
Tonight Lo: 45°F Lo: 7°C |
Tonight... Mostly cloudy. Chance of rain showers and slight chance of thunderstorms early in the evening, then slight chance of rain showers in the late evening and early morning. Lows in the mid 40s. East winds up to 10 mph shifting to the southeast after midnight. Chance of precipitation 40%. |
Sat Hi: 68°FHi: 20°C Lo: 47°F Lo: 8°C |
Saturday... Warmer. Partly sunny. Patchy smoke through the day. A 20% chance of thunderstorms in the afternoon. Highs 63 to 71. South winds up to 10 mph. |
Sun Hi: 71°FHi: 22°C Lo: 51°F Lo: 11°C |
Sunday... Sunny. A 20% chance of rain showers in the afternoon. Highs 65 to 75. West winds up to 10 mph. Gusts up to 25 mph in the afternoon. |
Mon Hi: 69°FHi: 21°C Lo: 49°F Lo: 9°C |
Monday... Partly sunny. Highs 63 to 73. |
| Tue Hi: 66°FHi: 19°C Lo: 46°F Lo: 8°C |
Tuesday... Mostly cloudy. Chance of rain showers in the morning, then chance of rain showers and slight chance of thunderstorms in the afternoon. Highs 60 to 70. Chance of precipitation 50%. |
| Wed Hi: 67°FHi: 19°C Lo: 47°F Lo: 8°C |
Wednesday... Partly cloudy. A 20% chance of thunderstorms. Lows 42 to 48. Highs 61 to 71. |
Thu Hi: 70°FHi: 21°C Lo: 49°F Lo: 9°C |
Thursday... Sunny. Highs 64 to 74. |
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