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Fillmore, IL Weather Forecast
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Fillmore Weather Forecast
| OVERNIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | MONDAY | TUESDAY | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY |
 |  |  |  |  | | | | |  | |
| Mostly Clear | Sunny | Partly Cloudy | Chance of T-Storm | Thunderstorms | Mostly Clear | Mostly Clear | Mostly Clear | Mostly Clear | Chance of T-Storm | Chance of T-Storm |
| Lo: 75°FLo: 24°C | Hi: 99°FHi: 37°C | Lo: 71°FLo: 22°C | Hi: 99°FHi: 37°C | Lo: 70°FLo: 21°C | Hi: 90°FHi: 32°C Lo: 65°FLo: 18°C | Hi: 90°FHi: 32°C Lo: 65°FLo: 18°C | Hi: 99°FHi: 37°C Lo: 75°FLo: 24°C | Hi: 99°FHi: 37°C Lo: 75°FLo: 24°C | Lo: 71°FLo: 22°C | Hi: 91°FHi: 33°C |
| POP: 20% | POP: 20% | POP: 20% | POP: 20% |
POP = Probability of Precipitation.
Weather Outlook Updated: 1117 PM CDT Thu Sep 03 2026 
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Issued: 1148 PM CDT Thu Sep 3 2026
Key Messages
- A late summer heat wave will continue areawide through Saturday.
- Temperatures are forecast to "cool" slightly Sunday into Labor Day before another period of near-record breaking heat returns by Wednesday.
Aviation
/00Z TAFS THROUGH 06Z SATURDAY/... Issued at 1147 PM CDT Thu Sep 3 2026
Dry and VFR flight conditions will persist through the TAF period with light winds, mainly southwesterly during the day Friday.
Watches / Warnings / Advisories
/WARNINGS/ADVISORIES... MO...Extreme Heat Warni...