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Grob Lake Weather Forecast
| TODAY | TONIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT |
 |  |  | | |  |  | | | | | |
| Mostly Cloudy | Clearing | Mostly Sunny | Partly Cloudy | Mostly Cloudy | Chance of Rain | Chance of Rain | Partly Cloudy | Mostly Cloudy | Partly Cloudy | Mostly Cloudy | Partly Cloudy |
| Hi: 60°FHi: 16°C | Lo: 30°FLo: -1°C | Hi: 65°FHi: 18°C | Lo: 36°FLo: 2°C | Hi: 65°FHi: 18°C | Lo: 45°FLo: 7°C | Hi: 65°FHi: 18°C | Lo: 40°FLo: 4°C | Hi: 66°FHi: 19°C | Lo: 40°FLo: 4°C | Hi: 65°FHi: 18°C | Lo: 36°FLo: 2°C |
| POP: 30% | POP: 20% |
POP = Probability of Precipitation.
Weather Outlook Updated: 1257 AM MDT Sun Sep 27 2026 
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Issued: 256 AM MDT Sun Sep 27 2026
Discussion
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KEY MESSAGES:- Near-normal temperatures this upcoming week, with dry conditions.
- Increasing winds Tuesday, especially across northwest Montana and the higher terrain.
- Confidence increasing for a warm, dry early October beyond the 7 day forecast.
GOES Satellite imagery early this morning shows an upper level low spinning off the southern Oregon/northern California coast, with southwesterly flow aloft bringing a shield of cirrus clouds over the Northern Rockies. This low will begin to s...