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Arrowhead Lake, MT 7-Day Weather Forecast
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Arrowhead Lake Weather Forecast
Arrowhead Lake, MT Weather Forecast Date: 350 AM MDT Fri Sep 18 2026
Weather forecast for Arrowhead Lake, MT
Today Hi: 69°FHi: 21°C Lo: 39°F Lo: 4°C |
Today... Decreasing clouds. Scattered rain showers in the morning, then numerous rain showers and isolated thunderstorms early in the afternoon. Rain showers and scattered thunderstorms late in the afternoon. Some thunderstorms May produce heavy rainfall late in the afternoon. Highs in the upper 60s. Southwest winds 5 to 10 mph. Chance of precipitation 90%. |
Sat Hi: 59°FHi: 15°C Lo: 35°F Lo: 2°C |
Saturday... Patchy fog in the morning. Chance of rain showers and slight chance of thunderstorms in the morning, then rain showers and chance of thunderstorms in the afternoon. Cooler. Some thunderstorms May produce heavy rainfall. Highs in the upper 50s. West winds 5 to 10 mph. Chance of precipitation 80%. |
| Sun Hi: 59°FHi: 15°C Lo: 31°F Lo: -1°C |
Sunday... Patchy fog early in the morning. Rain showers likely in the morning, then chance of rain showers and slight chance of thunderstorms in the afternoon. Some thunderstorms May produce heavy rainfall in the afternoon. Highs in the upper 50s. Northwest winds 5 to 10 mph. Chance of precipitation 60%. |
Mon Hi: 65°FHi: 18°C Lo: 31°F Lo: -1°C |
Monday... Sunny. Patchy fog early in the morning. Highs in the mid 60s. |
| Tue Hi: 69°FHi: 21°C Lo: 35°F Lo: 2°C |
Tuesday... Mostly sunny. A 20% chance of showers and thunderstorms in the afternoon. Highs in the upper 60s. |
Wed Hi: 69°FHi: 21°C Lo: 35°F Lo: 2°C |
Wednesday... Mostly sunny. Highs in the upper 60s. |
| Thu Hi: 71°FHi: 22°C |
Thursday... Sunny. Highs in the lower 70s. |
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