Fayetteville, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Fayetteville, a village in St. Clair County, Illinois.
This Afternoon
97°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms after 3pm. Sunny, with a high near 97. Heat index values as high as 105. Southwest wind around 2 mph. Chance of precipitation is 30%.
7-day forecast for Fayetteville
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 97°F | Chance Showers And Thunderstorms | 2 mph SW | 26% |
| Tonight | 71°F | Slight Chance Showers And Thunderstorms then Mostly Clear | 2 mph SE | 24% |
| Saturday | 97°F | Mostly Sunny | 2 to 7 mph SW | 6% |
| Saturday Night | 72°F | Partly Cloudy | 3 mph S | 0% |
| Sunday | 94°F | Mostly Sunny | 2 to 6 mph W | 14% |
| Sunday Night | 67°F | Slight Chance Showers And Thunderstorms | 5 mph N | 47% |
| Monday | 82°F | Showers And Thunderstorms Likely | 5 to 9 mph N | 62% |
| Monday Night | 60°F | Showers And Thunderstorms Likely | 6 to 9 mph N | 62% |
| Tuesday | 72°F | Slight Chance Rain Showers then Partly Sunny | 10 mph N | 23% |
| Tuesday Night | 54°F | Mostly Cloudy | 5 to 10 mph N | 7% |
| Wednesday | 75°F | Mostly Sunny | 5 to 8 mph N | 3% |
| Wednesday Night | 55°F | Partly Cloudy | 2 to 6 mph N | 2% |
| Thursday | 76°F | Mostly Sunny | 2 to 7 mph N | 1% |
| Thursday Night | 57°F | Partly Cloudy | 2 to 6 mph N | 2% |
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 Sep 18, 2026.