Fairmont, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Fairmont, a community in Will County, Illinois.
Tonight
60°F
Rain
Rain. Cloudy. Low around 60, with temperatures rising to around 62 overnight. South wind around 15 mph, with gusts as high as 30 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for Fairmont
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 60°F | Rain | 15 mph S | 86% |
| Wednesday | 63°F | Chance Rain then Mostly Cloudy | 15 mph SSW | 57% |
| Wednesday Night | 48°F | Mostly Cloudy | 15 mph SW | 12% |
| Thursday | 58°F | Mostly Cloudy then Chance Rain Showers | 10 to 15 mph WSW | 25% |
| Thursday Night | 43°F | Chance Rain Showers | 5 to 10 mph WNW | 38% |
| Friday | 54°F | Slight Chance Rain Showers | 10 mph N | 24% |
| Friday Night | 37°F | Partly Cloudy | 5 to 10 mph NNW | 10% |
| Saturday | 52°F | Mostly Sunny | 5 mph WNW | 7% |
| Saturday Night | 35°F | Partly Cloudy | 0 to 5 mph WSW | 3% |
| Sunday | 57°F | Mostly Sunny | 5 to 10 mph W | 12% |
| Sunday Night | 36°F | Mostly Clear | 5 to 10 mph WNW | 8% |
| Monday | 61°F | Sunny | 5 to 10 mph WSW | 4% |
| Monday Night | 40°F | Mostly Clear | 5 to 10 mph WSW | 2% |
| Tuesday | 62°F | Sunny | 5 mph WNW | 0% |
Forecast source: National Weather Service (api.weather.gov) for Fairmont (41.561, -88.059). Updated through the day.
Growing snapshot for Fairmont
Last spring frost
Apr 19
First fall frost
Oct 25
Growing season
188 days
Hardiness zone
6a
More local growing data for Fairmont: nearby ZIP 60432 weather · frost dates · planting calendar · Illinois frost dates
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Climate data from the nearest NOAA station, Joliet Brandon Rd Dam, Il (4.5 mi from Fairmont). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.