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Big Flat Reservoir Weather Forecast
| TONIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY |
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| Chance of T-Storm | Thunderstorms | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Thunderstorms | Chance of Showers | Chance of T-Storm | Partly Cloudy | Chance of T-Storm | Chance of Showers | Chance of T-Storm |
| Lo: 59°FLo: 15°C | Hi: 70°FHi: 21°C | Lo: 55°FLo: 13°C | Hi: 69°FHi: 21°C | Lo: 50°FLo: 10°C | Hi: 65°FHi: 18°C | Lo: 50°FLo: 10°C | Hi: 60°FHi: 16°C | Lo: 49°FLo: 9°C | Hi: 60°FHi: 16°C | Lo: 49°FLo: 9°C | Hi: 60°FHi: 16°C |
| POP: 20% | POP: 30% | POP: 20% | POP: 50% | POP: 50% | POP: 40% | POP: 40% | POP: 50% | POP: 40% | POP: 40% | POP: 40% |
POP = Probability of Precipitation.
Weather Outlook Updated: 1244 PM MDT Thu Aug 27 2026 
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Issued: 1053 PM MDT Thu Aug 27 2026
Key Messages
- Scattered showers and thunderstorms will develop across Utah and southwest Wyoming again late Friday morning through Friday night, with gusty winds and isolated flash flooding being the main threats.
- An approaching trough on Saturday will bring noticeably cooler temperatures, gusty winds, and more widespread precipitation. Strong to severe storms will be a possibility.
- An active pattern will continue through at least the first half of next week.
Discussion
...High pressure is centered ...