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City of Grantsville, UtahGrantsville, UT Weather Forecast
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Grantsville Weather Forecast
| TODAY | TONIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT |
 |  |  |  | |  |  |  |  | | | |
| Partly Cloudy | Mostly Clear | Chance of T-Storm | Partly Cloudy | Chance of T-Storm | Chance of T-Storm | Chance of Showers | Chance of Rain | Mostly Clear | Mostly Clear | Mostly Clear | Mostly Clear |
| Hi: 69°FHi: 21°C | Lo: 51°FLo: 11°C | Hi: 70°FHi: 21°C | Lo: 51°FLo: 11°C | Hi: 70°FHi: 21°C | Lo: 49°FLo: 9°C | Hi: 51°FHi: 11°C | Lo: 40°FLo: 4°C | Hi: 51°FHi: 11°C Lo: 40°FLo: 4°C | Hi: 51°FHi: 11°C Lo: 40°FLo: 4°C | Hi: 59°FHi: 15°C Lo: 45°FLo: 7°C | Hi: 59°FHi: 15°C Lo: 45°FLo: 7°C |
| POP: 20% | POP: 70% | POP: 100% | POP: 90% | POP: 30% |
POP = Probability of Precipitation.
Weather Outlook Updated: 1241 AM MDT Tue Oct 20 2026 
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Issued: 1057 PM MDT Mon Oct 19 2026
Key Messages
- Widespread precipitation returns Wednesday morning across southern Utah, with coverage expanding northward through Friday. Many areas will see precipitation accumulations between 0.5-1.5" through this period, with locally up to 2.0-2.5".
- The heavy rain will bring a threat of flash flooding to southern and central Utah, and there is a Slight Risk of Excessive Rainfall across southern Utah Wednesday and Thursday.
- A few strong thunderstorms may be capable of producing gusty winds and ha...