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Arrow Lake Weather Forecast
| REST OF TODAY | TONIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT |
 |  |  |  | | |  | |  | | | |
| Sunny | Partly Cloudy | Rain Showers | Chance of Showers | Mostly Sunny | Chance of Showers | Snow Showers | Snow Showers | Partly Cloudy | Partly Cloudy | Sunny | Partly Cloudy |
| Hi: 70°FHi: 21°C | Lo: 44°FLo: 7°C | Hi: 63°FHi: 17°C | Lo: 37°FLo: 3°C | Hi: 63°FHi: 17°C | Lo: 42°FLo: 6°C | Hi: 53°FHi: 12°C | Lo: 34°FLo: 1°C | Hi: 54°FHi: 12°C Lo: 32°FLo: 0°C | Hi: 54°FHi: 12°C Lo: 32°FLo: 0°C | Hi: 57°FHi: 14°C | Hi: 60°FHi: 16°C Lo: 36°FLo: 2°C |
| POP: 20% | POP: 20% | POP: 30% | POP: 50% | POP: 50% |
POP = Probability of Precipitation.
Weather Outlook Updated: 1232 PM MDT Thu Sep 10 2026 
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Issued: 133 PM MDT Thu Sep 10 2026
Key Messages
- Winds will gradually subside through the evening hours tonight.
- A cold front will bring colder temperatures and increasing chances for rain during the day on Friday, most notably over the plains of Central and North Central Montana.
- A large upper level disturbance will bring even cooler temperatures and better chances for widespread precipitation during the day on Sunday, with mountain snowfall along the Continental Divide.
Discussion
...- Meteorological Overview:
A significant pattern s...