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Sump Lake Weather Forecast
| REST OF THE NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY |
 | |  |  |  |  | |  | | | |  |
| Patchy Fog | Patchy Fog | Clear | Chance of T-Storm | Chance of T-Storm | Partly Sunny | Mostly Clear | Mostly Clear | Clear | Mostly Clear | Mostly Clear | Partly Cloudy |
| Lo: 49°FLo: 9°C | Hi: 75°FHi: 24°C | Lo: 49°FLo: 9°C | Hi: 79°FHi: 26°C | Lo: 59°FLo: 15°C | Hi: 79°FHi: 26°C | Hi: 75°FHi: 24°C Lo: 51°FLo: 11°C | Hi: 75°FHi: 24°C Lo: 51°FLo: 11°C | Lo: 49°FLo: 9°C | Hi: 75°FHi: 24°C Lo: 49°FLo: 9°C | Hi: 75°FHi: 24°C Lo: 49°FLo: 9°C | Hi: 79°FHi: 26°C |
| POP: 50% | POP: 80% |
POP = Probability of Precipitation.
Weather Outlook Updated: 122 AM CDT Wed Aug 19 2026 
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Issued: 151 AM CDT Wed Aug 19 2026
Key Messages
- Some early morning patchy fog, otherwise quiet weather today, then showers and a few storms arrive Thursday afternoon into Friday (50-80% chance). A drought busting rain is not expected.
- High temps remain near seasonal norms into the weekend with a few cool nights across northern WI.
Discussion
... Issued at 151 AM CDT Wed Aug 19 2026
Shower/Storm Potential...Next round of organized showers and storms arrives Thursday into Friday (50-80% chance), as a cold ...