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Chapin, IL Weather Forecast
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Chapin Weather Forecast
| REST OF TONIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | LABOR DAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY |
 |  |  | | | | | | | |  |  |
| Mostly Clear | Sunny | Partly Cloudy | Mostly Sunny | Mostly Clear | Mostly Clear | Mostly Clear | Mostly Clear | Mostly Clear | Mostly Sunny | Chance of Showers | Partly Cloudy |
| Lo: 75°FLo: 24°C | Hi: 99°FHi: 37°C | Lo: 69°FLo: 21°C | Hi: 90°FHi: 32°C | Lo: 65°FLo: 18°C | Hi: 89°FHi: 32°C Lo: 65°FLo: 18°C | Hi: 89°FHi: 32°C Lo: 65°FLo: 18°C | Hi: 95°FHi: 35°C Lo: 71°FLo: 22°C | Hi: 95°FHi: 35°C Lo: 71°FLo: 22°C | Hi: 99°FHi: 37°C | Lo: 70°FLo: 21°C | Hi: 90°FHi: 32°C Lo: 61°FLo: 16°C |
| POP: 30% |
POP = Probability of Precipitation.
Weather Outlook Updated: 1237 AM CDT Sat Sep 05 2026 
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Issued: 1215 AM CDT Sat Sep 5 2026
Key Messages
- Dangerous Heat Saturday: Heat index values will reach to around 105 degrees again on Saturday. The Extreme Heat Warning has been expanded to cover all of central Illinois.
- Brief Weekend Relief: A cold front pushing south will bring slight less hot and humid conditions to northern areas Sunday and Monday, dropping highs into the mid-to-upper 80s. Southern areas will remain warmer in the low 90s.
- Heat Returns Next Week: The brief break in oppressive heat will be short-lived. Widespread...