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Arch Lake, MT 7-Day Weather Forecast
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Arch Lake Weather Forecast
Arch Lake, MT Weather Forecast Date: 419 AM MDT Sat Sep 19 2026
Weather forecast for Arch Lake, MT
Today Hi: 59°FHi: 15°C Lo: 31°F Lo: -1°C |
Today... Scattered rain showers in the morning. Isolated thunderstorms late in the morning, then numerous rain showers and scattered thunderstorms in the afternoon. Some thunderstorms May produce heavy rainfall in the late morning and afternoon. Highs in the upper 50s. Northwest winds 5 to 10 mph. Chance of precipitation 60%. |
Sun Hi: 59°FHi: 15°C Lo: 30°F Lo: -1°C |
Sunday... Mostly cloudy. Patchy fog early in the morning. Chance of rain showers early in the morning, then slight chance of rain showers in the late morning and afternoon. Slight chance of thunderstorms late in the afternoon. Some thunderstorms May produce heavy rainfall late in the afternoon. Highs in the upper 50s. West winds 5 to 10 mph. Chance of precipitation 40%. |
Mon Hi: 69°FHi: 21°C Lo: 31°F Lo: -1°C |
Monday... Mostly sunny. Patchy fog early in the morning. Highs in the upper 60s. Light and variable winds in the morning becoming west 5 to 10 mph in the afternoon. |
Tue Hi: 69°FHi: 21°C Lo: 35°F Lo: 2°C |
Tuesday... Mostly sunny. Highs in the upper 60s. |
Wed Hi: 69°FHi: 21°C Lo: 35°F Lo: 2°C |
Wednesday... Mostly sunny. A 20% chance of rain showers in the afternoon. Highs in the upper 60s. |
| Thu Hi: 71°FHi: 22°C Lo: 35°F Lo: 2°C |
Thursday... Sunny. Highs in the lower 70s. |
| Fri Hi: 71°FHi: 22°C |
Friday... Mostly sunny. Highs in the lower 70s. |
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