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Alton Park, IL Weather Forecast
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Alton Park Weather Forecast
| THIS AFTERNOON | TONIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | LABOR DAY |
 |  | | | | | | |  |  |  | |
| Sunny | Clear | Sunny | Mostly Clear | Sunny | Mostly Clear | Mostly Clear | Mostly Clear | Chance of T-Storm | Chance of T-Storm | Partly Cloudy | Mostly Sunny |
| Hi: 99°FHi: 37°C | Lo: 79°FLo: 26°C | Hi: 99°FHi: 37°C | Lo: 79°FLo: 26°C | Hi: 99°FHi: 37°C | Hi: 99°FHi: 37°C Lo: 79°FLo: 26°C | Hi: 99°FHi: 37°C Lo: 79°FLo: 26°C | Hi: 99°FHi: 37°C Lo: 79°FLo: 26°C | Hi: 95°FHi: 35°C Lo: 75°FLo: 24°C | Hi: 95°FHi: 35°C Lo: 75°FLo: 24°C | Lo: 71°FLo: 22°C | Hi: 91°FHi: 33°C |
| POP: 20% | POP: 20% |
POP = Probability of Precipitation.
Weather Outlook Updated: 1222 PM CDT Tue Sep 01 2026 
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Issued: 1146 AM CDT Tue Sep 1 2026
Key Messages
- Unseasonably hot weather is expected to continue the rest of the week.
Aviation
/12Z TAFS THROUGH 18Z WEDNESDAY/... Issued at 1145 AM CDT Tue Sep 1 2026
Dry/VFR conditions with light south/southwest winds will continue through Wednesday morning. A mostly clear sky is also expected, with just a few diurnal cumulus this afternoon potentially and some thin high cirrus.
Watches / Warnings / Advisories
/WARNINGS/ADVISORIES... MO...Heat Advisory until 8 PM CDT Saturday for MOZ018-019-026-027- 0...