Fairfield, IL Weather & Growing Conditions
This Afternoon
78°F
Mostly Sunny
Mostly sunny. High near 78, with temperatures falling to around 75 in the afternoon. South southeast wind around 18 mph, with gusts as high as 25 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 78°F | Mostly Sunny | 18 mph SSE | 3% |
| Tonight | 57°F | Rain Showers | 9 to 16 mph S | 98% |
| Wednesday | 67°F | Slight Chance Rain Showers then Partly Sunny | 6 to 12 mph SW | 15% |
| Wednesday Night | 45°F | Partly Cloudy | 3 mph WSW | 0% |
| Thursday | 68°F | Sunny | 2 to 9 mph WSW | 0% |
| Thursday Night | 45°F | Partly Cloudy | 2 mph WNW | 4% |
| Friday | 60°F | Mostly Cloudy | 2 to 9 mph NW | 2% |
| Friday Night | 39°F | Mostly Cloudy | 2 to 6 mph NNW | 1% |
| Saturday | 57°F | Mostly Sunny | 1 to 5 mph NNW | 0% |
| Saturday Night | 35°F | Partly Cloudy | 0 mph | 2% |
| Sunday | 61°F | Sunny | 0 to 7 mph WNW | 7% |
| Sunday Night | 35°F | Mostly Clear | 2 mph NW | 6% |
| Monday | 64°F | Sunny | 1 to 7 mph W | 2% |
| Monday Night | 39°F | Mostly Clear | 3 mph SW | 0% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Fairfield, IL
Last spring frost
Apr 7
First fall frost
Oct 26
Growing season
201 days
Hardiness zone
6b
Explore more for Fairfield, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Fairfield Radio Wfiw, Il (2 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.