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Wethersfield, IL Weather Forecast
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Wethersfield Weather Forecast
| THIS AFTERNOON | TONIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY |
 |  |  |  | | |  | |  | | | |
| Sunny | Chance of T-Storm | Patchy Fog | Partly Cloudy | Mostly Sunny | Partly Cloudy | Partly Cloudy | Mostly Sunny | Chance of Showers | Mostly Sunny | Chance of Showers | Mostly Sunny |
| Hi: 95°FHi: 35°C | Lo: 71°FLo: 22°C | Hi: 90°FHi: 32°C | Lo: 65°FLo: 18°C | Hi: 85°FHi: 29°C | Hi: 85°FHi: 29°C Lo: 61°FLo: 16°C | Hi: 85°FHi: 29°C Lo: 61°FLo: 16°C | Hi: 91°FHi: 33°C | Lo: 71°FLo: 22°C | Hi: 91°FHi: 33°C | Lo: 65°FLo: 18°C | Hi: 81°FHi: 27°C |
| POP: 20% | POP: 50% | POP: 30% |
POP = Probability of Precipitation.
Weather Outlook Updated: 231 PM CDT Fri Sep 04 2026 
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Issued: 219 PM CDT Fri Sep 4 2026
Key Messages
- Dangerous heat continues through Saturday, with peak heat indices of 100 to 110 degrees. Extreme heat warnings and heat advisories are in effect and have been extended.
- There remains a low risk (<15%) for isolated showers/storms this afternoon and Saturday afternoon/evening. There is a Marginal (level 1 of 5) risk for an isolated severe storm north of Hwy 20.
- Less humid Sunday/Monday, before heat and humidity returns mid-week. The overall pattern has a 55-70% probability of above normal temperatures through mid-September.
Aviation
/18Z TAFS THROUGH 18Z SATURDAY/... Issued at 1226 PM CDT Fri Sep 4 2026
VFR conditions to persist through the TAF cycle ...