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Alta High School Weather Forecast
| TODAY | TONIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | THURSDAY | THURSDAY NIGHT | FRIDAY |
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| Chance of T-Storm | Mostly Clear | Sunny | Partly Cloudy | Partly Cloudy | Partly Cloudy | Chance of Showers | Chance of Showers | Mostly Clear | Mostly Clear | Partly Cloudy | Partly Cloudy |
| Hi: 70°FHi: 21°C | Lo: 49°FLo: 9°C | Hi: 71°FHi: 22°C | Lo: 50°FLo: 10°C | Hi: 79°FHi: 26°C | Lo: 55°FLo: 13°C | Hi: 75°FHi: 24°C Lo: 51°FLo: 11°C | Hi: 75°FHi: 24°C Lo: 51°FLo: 11°C | Hi: 80°FHi: 27°C Lo: 55°FLo: 13°C | Hi: 80°FHi: 27°C Lo: 55°FLo: 13°C | Hi: 81°FHi: 27°C Lo: 59°FLo: 15°C | Hi: 81°FHi: 27°C Lo: 59°FLo: 15°C |
| POP: 20% | POP: 40% | POP: 40% |
POP = Probability of Precipitation.
Weather Outlook Updated: 1249 AM MDT Sat Sep 19 2026 
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Issued: 514 AM MDT Sat Sep 19 2026
Key Messages
.KEY MESSAGES, Issued 1002 PM MDT Fri Sep 18 2026...- Periods of showers and thunderstorms will continue tonight into Friday, with the best coverage over northern Utah and southwest Wyoming. The focus of showers and storms will gradually shift east during the day Friday. Hail, heavy rain, and lightning will be the primarily threats. Flash flooding remains a threat as well.
- Temperatures will be noticeably cooler over the weekend, particularly for northern Utah and southwest Wyoming, wi...