Fairfield, IL Weather & Growing Conditions
Today
85°F
Sunny
Sunny, with a high near 85. East wind around 1 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 85°F | Sunny | 1 mph E | 0% |
| Tonight | 62°F | Mostly Clear | 1 mph NE | 0% |
| Wednesday | 87°F | Sunny | 1 mph S | 0% |
| Wednesday Night | 67°F | Partly Cloudy | 1 mph SSE | 7% |
| Thursday | 86°F | Chance Showers And Thunderstorms | 1 to 5 mph SSW | 31% |
| Thursday Night | 69°F | Chance Showers And Thunderstorms | 0 to 3 mph SSE | 55% |
| Friday | 86°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 1 to 5 mph SW | 55% |
| Friday Night | 68°F | Chance Showers And Thunderstorms | 1 mph WSW | 42% |
| Saturday | 87°F | Chance Showers And Thunderstorms | 3 mph SSW | 42% |
| Saturday Night | 69°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 2 mph S | 20% |
| Sunday | 89°F | Mostly Sunny | 1 to 7 mph SSW | 9% |
| Sunday Night | 71°F | Mostly Clear | 6 mph SSW | 7% |
| Monday | 91°F | Sunny | 3 to 7 mph SSW | 7% |
| Monday Night | 72°F | Mostly Clear | 6 mph SSW | 12% |
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 Aug 4, 2026.