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Great Falls Reservoir Weather Forecast
| TONIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY |
 |  | | |  |  | | | | | | |
| Mostly Clear | Sunny | Mostly Clear | Mostly Sunny | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Mostly Sunny |
| Lo: 65°FLo: 18°C | Hi: 90°FHi: 32°C | Lo: 69°FLo: 21°C | Hi: 90°FHi: 32°C | Lo: 69°FLo: 21°C | Hi: 89°FHi: 32°C | Lo: 69°FLo: 21°C | Hi: 85°FHi: 29°C | Lo: 69°FLo: 21°C | Hi: 85°FHi: 29°C | Lo: 69°FLo: 21°C | Hi: 89°FHi: 32°C |
| POP: 50% | POP: 70% | POP: 70% | POP: 70% | POP: 70% | POP: 50% | POP: 50% |
POP = Probability of Precipitation.
Weather Outlook Updated: 718 PM EDT Mon Aug 24 2026 
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Instant definitions for any meteorological term.
Instant definitions for any meteorological term.
Issued: 715 PM EDT Mon Aug 24 2026
Key Messages
1. Dry weather with comfortable humidity levels will continue through Tuesday. Then humidity increases along with daily shower and thunderstorm chances returning Wednesday and continuing through the rest of the week.
Discussion
... Key message 1: Dry weather with comfortable humidity levels will continue through Tuesday. Then humidity increases along with daily shower and thunderstorm chances returning Wednesday and continuing through the rest of the week.
The upper pattern still consis...