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Upper Island Lake Weather Forecast
| THIS AFTERNOON | TONIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | FRIDAY | SATURDAY | SUNDAY |
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| Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Partly Cloudy | Mostly Clear | Mostly Clear | Mostly Clear | Mostly Clear |
| Hi: 51°FHi: 11°C | Lo: 41°FLo: 5°C | Hi: 51°FHi: 11°C | Lo: 41°FLo: 5°C | Hi: 55°FHi: 13°C | Lo: 41°FLo: 5°C | Hi: 61°FHi: 16°C Lo: 41°FLo: 5°C | Hi: 61°FHi: 16°C Lo: 41°FLo: 5°C | Hi: 61°FHi: 16°C Lo: 41°FLo: 5°C | Hi: 61°FHi: 16°C Lo: 41°FLo: 5°C |
| POP: 70% | POP: 50% | POP: 20% | POP: 40% |
POP = Probability of Precipitation.
Weather Outlook Updated: 1238 PM MDT Mon Sep 28 2026 
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Issued: 157 PM MDT Mon Sep 28 2026
Key Messages
- Scattered to widespread precipitation showers and storms are expected through midweek.
- This rainfall increases flooding concerns, especially within and adjacent to the southern San Juans.
- A Flood Watch is in effect for southeast Utah and southwest Colorado through 6AM Wednesday.
Discussion
... Issued at 1256 PM MDT Mon Sep 28 2026
WIDESPREAD PRECIPITATION THROUGH TUESDAY:
Moisture advection from tropical storm activity in the Eastern Pacific will bring anomalous moisture to our region th...