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Mustard Reservoir Weather Forecast
| TODAY | TONIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT |
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| Chance of T-Storm | Chance of T-Storm | Mostly Sunny | Mostly Cloudy | Mostly Sunny | Partly Cloudy | Sunny | Partly Cloudy | Sunny | Partly Cloudy | Chance of T-Storm | Chance of Rain |
| Hi: 83°FHi: 28°C | Lo: 53°FLo: 12°C | Hi: 72°FHi: 22°C | Lo: 50°FLo: 10°C | Hi: 71°FHi: 22°C | Lo: 47°FLo: 8°C | Hi: 76°FHi: 24°C | Lo: 50°FLo: 10°C | Hi: 80°FHi: 27°C | Lo: 54°FLo: 12°C | Hi: 77°FHi: 25°C | Lo: 53°FLo: 12°C |
| POP: 50% |
POP = Probability of Precipitation.
Weather Outlook Updated: 1231 AM MDT Tue Sep 01 2026 
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Instant definitions for any meteorological term.
Instant definitions for any meteorological term.
Issued: 911 PM MDT Mon Aug 31 2026
Key Messages
- Showers and thunderstorms will return and continue through the next several days
- Critical to near-critical fire conditions for thunderstorms expected Tuesday for thunderstorms and wind/humidity Wednesday
- Cooler temperatures expected from Wednesday onward as low pressure settles in across the western U.S.
Discussion
... Issued at 104 PM MDT Mon Aug 31 2026
A weak "wave" will lift north across eastern Idaho through tomorrow morning, bringing an increase in showers and thunderstorms includ...