Fairmont City, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Fairmont City, a village in St. Clair County, Illinois.
Today
60°F
Patchy Drizzle then Mostly Cloudy
Patchy drizzle before noon. Mostly cloudy, with a high near 60. West wind 8 to 13 mph.
7-day forecast for Fairmont City
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 60°F | Patchy Drizzle then Mostly Cloudy | 8 to 13 mph W | 12% |
| Tonight | 45°F | Partly Cloudy | 6 mph SW | 0% |
| Thursday | 66°F | Sunny | 6 to 10 mph W | 0% |
| Thursday Night | 47°F | Mostly Cloudy | 6 mph NW | 3% |
| Friday | 58°F | Partly Sunny | 6 to 12 mph N | 1% |
| Friday Night | 37°F | Partly Cloudy | 1 to 7 mph N | 0% |
| Saturday | 56°F | Mostly Sunny | 1 to 5 mph N | 0% |
| Saturday Night | 36°F | Partly Cloudy | 1 mph NW | 0% |
| Sunday | 61°F | Sunny | 1 to 6 mph NW | 1% |
| Sunday Night | 37°F | Clear | 2 mph W | 0% |
| Monday | 67°F | Sunny | 0 to 5 mph SW | 0% |
| Monday Night | 41°F | Clear | 2 mph SW | 0% |
| Tuesday | 69°F | Sunny | 5 mph W | 1% |
| Tuesday Night | 43°F | Mostly Clear | 1 mph N | 2% |
Forecast source: National Weather Service (api.weather.gov) for Fairmont City (38.646, -90.100). Updated through the day.
Growing snapshot for Fairmont City
Last spring frost
Apr 8
First fall frost
Oct 26
Growing season
200 days
Hardiness zone
7a
More local growing data for Fairmont City: nearby ZIP 62204 weather · frost dates · planting calendar · Illinois frost dates
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Climate data from the nearest NOAA station, Cahokia St Louis Ap, Il (5.2 mi from Fairmont City). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.