Fayetteville, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Fayetteville, a village in St. Clair County, Illinois.
Today
87°F
Sunny
Sunny, with a high near 87. Southeast wind around 5 mph.
7-day forecast for Fayetteville
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 87°F | Sunny | 5 mph SE | 0% |
| Tonight | 66°F | Mostly Clear | 0 to 5 mph SE | 0% |
| Wednesday | 90°F | Sunny | 0 to 5 mph S | 4% |
| Wednesday Night | 71°F | Partly Cloudy then Chance Showers And Thunderstorms | 5 mph S | 52% |
| Thursday | 87°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 5 mph S | 68% |
| Thursday Night | 70°F | Chance Showers And Thunderstorms | 2 mph S | 52% |
| Friday | 87°F | Chance Showers And Thunderstorms | 2 mph SW | 52% |
| Friday Night | 70°F | Chance Showers And Thunderstorms | 1 mph SW | 39% |
| Saturday | 89°F | Chance Showers And Thunderstorms | 3 mph S | 39% |
| Saturday Night | 71°F | Partly Cloudy | 5 mph S | 10% |
| Sunday | 91°F | Sunny | 3 to 7 mph S | 7% |
| Sunday Night | 73°F | Mostly Clear | 7 mph S | 5% |
| Monday | 93°F | Sunny | 5 to 8 mph S | 5% |
| Monday Night | 74°F | Partly Cloudy | 8 mph S | 11% |
Forecast source: National Weather Service (api.weather.gov) for Fayetteville (38.378, -89.797). Updated through the day.
Growing snapshot for Fayetteville
Last spring frost
Apr 12
First fall frost
Oct 22
Growing season
191 days
Hardiness zone
6b
More local growing data for Fayetteville: nearby ZIP 62255 weather · frost dates · planting calendar · Illinois frost dates
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Climate data from the nearest NOAA station, Sparta 1 W, Il (14 mi from Fayetteville). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.