Mattoon, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Mattoon, a city in Coles County, Illinois.
This Afternoon
91°F
Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms. Mostly cloudy, with a high near 91. Southwest wind around 6 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Mattoon
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 91°F | Slight Chance Showers And Thunderstorms | 6 mph SW | 19% |
| Tonight | 70°F | Mostly Cloudy | 3 to 8 mph SSE | 14% |
| Sunday | 88°F | Partly Sunny then Chance Showers And Thunderstorms | 6 to 12 mph NW | 25% |
| Sunday Night | 61°F | Chance Showers And Thunderstorms | 9 to 13 mph NNE | 44% |
| Monday | 74°F | Showers And Thunderstorms Likely | 9 to 13 mph NE | 63% |
| Monday Night | 55°F | Chance Rain Showers | 9 to 13 mph NE | 42% |
| Tuesday | 69°F | Chance Rain Showers | 12 mph NE | 27% |
| Tuesday Night | 53°F | Mostly Cloudy | 6 to 13 mph NNE | 12% |
| Wednesday | 70°F | Partly Sunny | 10 mph N | 12% |
| Wednesday Night | 54°F | Mostly Cloudy | 5 to 9 mph NNE | 1% |
| Thursday | 74°F | Partly Sunny | 8 mph N | 1% |
| Thursday Night | 55°F | Mostly Cloudy | 3 to 7 mph NNE | 5% |
| Friday | 76°F | Partly Sunny then Slight Chance Rain Showers | 5 to 8 mph NNE | 15% |
| Friday Night | 54°F | Slight Chance Rain Showers then Partly Cloudy | 3 to 7 mph NE | 15% |
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 Sep 20, 2026.