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Harrison Lake Weather Forecast
| TODAY | TONIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT |
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| Windy | Windy | Mostly Sunny | Partly Cloudy | Partly Cloudy | Mostly Cloudy | Mostly Cloudy | Partly Cloudy | Mostly Sunny | Mostly Clear | Partly Cloudy | Chance of Snow |
| Hi: 56°FHi: 13°C | Lo: 35°FLo: 2°C | Hi: 50°FHi: 10°C | Lo: 35°FLo: 2°C | Hi: 56°FHi: 13°C | Lo: 36°FLo: 2°C | Hi: 55°FHi: 13°C | Lo: 35°FLo: 2°C | Hi: 55°FHi: 13°C | Lo: 36°FLo: 2°C | Hi: 55°FHi: 13°C | Lo: 35°FLo: 2°C |
| POP: 50% |
POP = Probability of Precipitation.
Weather Outlook Updated: 1222 AM MDT Sat Oct 17 2026 
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Issued: 131 AM MDT Sat Oct 17 2026
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KEY MESSAGES:- Gusty winds on Saturday, creating choppy conditions for area lakes, especially across northwest Montana.
- Mild temperatures next week, with shower chances for most areas by Thursday and Friday.
- Confidence growing for colder temperatures by next weekend.
GOES Water Vapor imagery this morning shows a shortwave trough moving eastward along the Washington coast, with a shield of cirrus clouds moving over the Northern Rockies. This shortwave trough is projected to move along ...