Mattoon, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Mattoon, a city in Coles County, Illinois.
Tonight
56°F
Rain
Rain before 1am, then rain showers. Mostly cloudy, with a low around 56. South wind 15 to 18 mph, with gusts as high as 28 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast for Mattoon
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 56°F | Rain | 15 to 18 mph S | 93% |
| Wednesday | 63°F | Slight Chance Rain Showers then Mostly Cloudy | 10 to 14 mph SW | 21% |
| Wednesday Night | 44°F | Mostly Cloudy | 8 mph SW | 0% |
| Thursday | 63°F | Sunny | 7 to 13 mph WSW | 1% |
| Thursday Night | 43°F | Mostly Cloudy | 5 mph WNW | 5% |
| Friday | 57°F | Partly Sunny | 6 to 9 mph NNW | 11% |
| Friday Night | 37°F | Partly Cloudy | 3 to 7 mph NNW | 6% |
| Saturday | 55°F | Mostly Sunny | 6 mph NW | 1% |
| Saturday Night | 34°F | Partly Cloudy | 2 mph W | 2% |
| Sunday | 60°F | Sunny | 2 to 8 mph W | 9% |
| Sunday Night | 34°F | Mostly Clear | 5 mph WNW | 6% |
| Monday | 63°F | Sunny | 3 to 10 mph WSW | 3% |
| Monday Night | 39°F | Mostly Clear | 6 mph WSW | 1% |
| Tuesday | 67°F | Sunny | 7 mph W | 1% |
Forecast source: National Weather Service (api.weather.gov) for Mattoon (39.478, -88.362). Updated through the day.
Growing snapshot for Mattoon
Last spring frost
Apr 11
First fall frost
Oct 29
Growing season
199 days
Hardiness zone
6a
More local growing data for Mattoon: nearby ZIP 61938 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Mattoon, Il (1.3 mi from Mattoon). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.