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.
This Afternoon
98°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms. Sunny, with a high near 98. Heat index values as high as 106. South wind around 3 mph. Chance of precipitation is 30%.
7-day forecast for Fairmont City
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 98°F | Chance Showers And Thunderstorms | 3 mph S | 26% |
| Tonight | 74°F | Slight Chance Showers And Thunderstorms then Mostly Clear | 5 mph SE | 24% |
| Saturday | 99°F | Mostly Sunny | 3 to 8 mph SW | 6% |
| Saturday Night | 75°F | Partly Cloudy | 5 mph S | 1% |
| Sunday | 95°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 3 to 7 mph W | 19% |
| Sunday Night | 68°F | Slight Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 8 mph N | 58% |
| Monday | 82°F | Rain Showers Likely | 7 to 10 mph N | 69% |
| Monday Night | 62°F | Showers And Thunderstorms Likely | 7 to 12 mph N | 69% |
| Tuesday | 73°F | Chance Rain Showers then Mostly Cloudy | 12 mph N | 27% |
| Tuesday Night | 55°F | Mostly Cloudy | 6 to 12 mph N | 6% |
| Wednesday | 76°F | Mostly Sunny | 9 mph N | 2% |
| Wednesday Night | 56°F | Partly Cloudy | 3 to 8 mph N | 2% |
| Thursday | 77°F | Mostly Sunny | 3 to 8 mph N | 3% |
| Thursday Night | 58°F | Partly Cloudy | 3 to 8 mph N | 3% |
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
Nearby towns & communities
Belleville
Brooklyn
Cahokia Heights
Caseyville
Darmstadt
Dupo
East St. Louis
Fairview Heights
Fayetteville
Floraville
Freeburg
Lebanon
Lenzburg
Marissa
Mascoutah
Millstadt
New Athens
O'Fallon
Paderborn
Rentchler
Sauget
Scott AFB
Shiloh
Smithton
St. Libory
Summerfield
Swansea
Washington Park
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 Sep 18, 2026.