Mattoon, IL Weather & Growing Conditions
Overnight
70°F
Mostly Clear
Mostly clear, with a low around 70. South southeast wind around 7 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 70°F | Mostly Clear | 7 mph SSE | 6% |
| Saturday | 91°F | Slight Chance Showers And Thunderstorms | 8 mph SW | 23% |
| Saturday Night | 70°F | Partly Cloudy | 6 mph S | 9% |
| Sunday | 87°F | Mostly Sunny then Chance Showers And Thunderstorms | 3 to 9 mph NNW | 36% |
| Sunday Night | 61°F | Chance Showers And Thunderstorms | 12 mph NE | 61% |
| Monday | 72°F | Showers And Thunderstorms Likely | 14 mph NE | 68% |
| Monday Night | 55°F | Chance Showers And Thunderstorms | 10 to 15 mph NE | 51% |
| Tuesday | 68°F | Chance Showers And Thunderstorms | 14 mph NNE | 29% |
| Tuesday Night | 53°F | Chance Showers And Thunderstorms then Mostly Cloudy | 7 to 13 mph NNE | 29% |
| Wednesday | 71°F | Mostly Sunny | 10 mph NNE | 5% |
| Wednesday Night | 54°F | Partly Cloudy | 5 to 10 mph N | 4% |
| Thursday | 72°F | Mostly Sunny | 6 to 9 mph N | 2% |
| Thursday Night | 55°F | Partly Cloudy | 3 to 8 mph NNE | 3% |
| Friday | 75°F | Mostly Sunny | 6 to 9 mph NE | 2% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Mattoon, IL
Last spring frost
Apr 11
First fall frost
Oct 29
Growing season
199 days
Hardiness zone
6a
Explore more for Mattoon, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Mattoon, Il (1.3 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.