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Fairfield, IL Weather Forecast
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Fairfield Weather Forecast
| TONIGHT | SUNDAY | SUNDAY NIGHT | LABOR DAY | MONDAY NIGHT | TUESDAY | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | SATURDAY |
 |  |  | | | | |  | |  |  | |
| Chance of T-Storm | Sunny | Mostly Clear | Sunny | Mostly Clear | Mostly Clear | Mostly Clear | Chance of Showers | Chance of Showers | Partly Cloudy | Partly Cloudy | Sunny |
| Lo: 70°FLo: 21°C | Hi: 90°FHi: 32°C | Lo: 61°FLo: 16°C | Hi: 90°FHi: 32°C | Lo: 65°FLo: 18°C | Hi: 99°FHi: 37°C Lo: 71°FLo: 22°C | Hi: 99°FHi: 37°C Lo: 71°FLo: 22°C | Lo: 71°FLo: 22°C | Hi: 89°FHi: 32°C | Hi: 89°FHi: 32°C Lo: 61°FLo: 16°C | Hi: 89°FHi: 32°C Lo: 61°FLo: 16°C | Hi: 91°FHi: 33°C |
| POP: 30% | POP: 30% | POP: 40% |
POP = Probability of Precipitation.
Weather Outlook Updated: 917 PM CDT Sat Sep 05 2026 
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Issued: 648 PM CDT Sat Sep 5 2026
Key Messages
- An Extreme Heat Warning remains in effect for the whole area through 8 PM tonight. A Heat Advisory is in effect for the western four SEMO counties along with Stoddard, New Madrid, and Fulton counties from 8 PM tonight through 8 PM tomorrow night.
- Isolated to scattered showers and thunderstorms will be possible throughout the Quad State this afternoon and evening. Gusty winds, lightning and brief heavy downpours will be the primary concerns.
- Labor Day will be the choice day of the wee...