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Summit Reservoir Weather Forecast
| REST OF TONIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY |
 |  |  | |  | |  |  | | |  | |
| Mostly Cloudy | Mostly Cloudy | Chance of Showers | Chance of Showers | Chance of T-Storm | Partly Sunny | Chance of Showers | Chance of Showers | Chance of T-Storm | Partly Sunny | Partly Cloudy | Partly Sunny |
| Lo: 49°FLo: 9°C | Hi: 61°FHi: 16°C | Lo: 51°FLo: 11°C | Hi: 70°FHi: 21°C | Lo: 55°FLo: 13°C | Hi: 75°FHi: 24°C | Lo: 55°FLo: 13°C | Hi: 70°FHi: 21°C | Lo: 55°FLo: 13°C | Hi: 79°FHi: 26°C | Lo: 55°FLo: 13°C | Hi: 75°FHi: 24°C |
| POP: 50% | POP: 20% | POP: 50% | POP: 40% | POP: 50% | POP: 50% |
POP = Probability of Precipitation.
Weather Outlook Updated: 1222 AM CDT Tue Sep 22 2026 
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Issued: 1252 AM CDT Tue Sep 22 2026
Key Messages
- There will be a brief break on Tuesday before spotty chances of rain return Tuesday night across central South Dakota. Occasional rain chances continue Wednesday through the end of the week with the highest chances (50-80%) Wednesday afternoon through Thursday morning.
- Temperatures will remain near to slightly below seasonal averages through Tuesday before climbing above normal Wednesday.
Discussion
... Issued at 1223 PM CDT Mon Sep 21 2026
The upper low is centered around Sioux City la...