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Haystack Lake Weather Forecast
| TODAY | TONIGHT | SUNDAY | SUNDAY NIGHT | LABOR DAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | THURSDAY | THURSDAY NIGHT | FRIDAY |
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| Sunny | Mostly Clear | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Partly Cloudy | Sunny | Partly Cloudy | Partly Cloudy | Chance of T-Storm | Partly Cloudy | Chance of T-Storm |
| Hi: 70°FHi: 21°C | Lo: 45°FLo: 7°C | Hi: 65°FHi: 18°C | Lo: 41°FLo: 5°C | Hi: 60°FHi: 16°C | Lo: 40°FLo: 4°C | Hi: 65°FHi: 18°C | Hi: 70°FHi: 21°C Lo: 45°FLo: 7°C | Hi: 70°FHi: 21°C Lo: 45°FLo: 7°C | Hi: 69°FHi: 21°C | Lo: 45°FLo: 7°C | Hi: 69°FHi: 21°C |
| POP: 50% | POP: 70% | POP: 30% | POP: 30% | POP: 30% |
POP = Probability of Precipitation.
Weather Outlook Updated: 1241 AM MDT Sat Sep 05 2026 
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Issued: 651 AM MDT Sat Sep 5 2026
Key Messages
.KEY MESSAGES, Issued 1038 PM MDT Fri Sep 4 2026...- Gusty winds out of the southwest persist through at least Sunday across much of Utah and southwest Wyoming, with an emphasis on areas west of I-15.
- Tropical moisture advects north into Utah Sunday increasing chances for precipitation, but uncertainty remains regarding QPF totals.
- There is a slight risk for flash flooding along with the potential for some strong thunderstorms.
- There is ~45% chance that tropical moisture returns towar...