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Fairfield, IL Weather Forecast
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Fairfield Weather Forecast
| OVERNIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | MONDAY | TUESDAY | WEDNESDAY |
 |  | | | | |  |  |  | | |
| Clear | Sunny | Clear | Sunny | Clear | Sunny | Partly Cloudy | Partly Cloudy | Mostly Cloudy | Mostly Cloudy | Mostly Sunny |
| Lo: 49°FLo: 9°C | Hi: 75°FHi: 24°C | Lo: 45°FLo: 7°C | Hi: 71°FHi: 22°C | Lo: 41°FLo: 5°C | Hi: 75°FHi: 24°C | Hi: 75°FHi: 24°C Lo: 45°FLo: 7°C | Hi: 75°FHi: 24°C Lo: 45°FLo: 7°C | Hi: 75°FHi: 24°C Lo: 49°FLo: 9°C | Hi: 75°FHi: 24°C Lo: 49°FLo: 9°C | Hi: 70°FHi: 21°C |
POP = Probability of Precipitation.
Weather Outlook Updated: 127 AM CDT Thu Oct 22 2026 
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Issued: 1215 AM CDT Thu Oct 22 2026
Key Messages
- Patchy fog is possible early this morning near bodies of water.
- Daily high temperatures today through Monday will be about 5 degrees above normal, trending closer to normal by the middle of next week.
- Dry weather conditions will prevail into early next week, with only a 10-15% chance of a sprinkle Tuesday night into Wednesday.
Discussion
... Issued at 1215 AM CDT Thu Oct 22 2026
A ridge axis associated with an Omega block is centered over the southern Plains this morning, while sfc high...