Mattoon, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Mattoon, a city in Coles County, Illinois.
Today
85°F
Patchy Fog then Sunny
Patchy fog before 9am. Sunny, with a high near 85. South southeast wind 1 to 6 mph.
7-day forecast for Mattoon
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 85°F | Patchy Fog then Sunny | 1 to 6 mph SSE | 0% |
| Tonight | 65°F | Mostly Clear | 3 mph SSE | 0% |
| Wednesday | 86°F | Sunny | 6 mph S | 1% |
| Wednesday Night | 67°F | Partly Cloudy then Chance Showers And Thunderstorms | 5 mph S | 39% |
| Thursday | 83°F | Showers And Thunderstorms Likely | 3 to 7 mph SSW | 71% |
| Thursday Night | 66°F | Chance Showers And Thunderstorms | 1 to 5 mph S | 34% |
| Friday | 84°F | Slight Chance Showers And Thunderstorms | 5 mph SSW | 21% |
| Friday Night | 66°F | Slight Chance Showers And Thunderstorms | 3 mph SSW | 20% |
| Saturday | 85°F | Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms | 6 mph SSW | 18% |
| Saturday Night | 69°F | Slight Chance Showers And Thunderstorms then Mostly Clear | 6 mph SSW | 16% |
| Sunday | 88°F | Sunny | 7 to 10 mph SSW | 8% |
| Sunday Night | 71°F | Mostly Clear | 9 mph SSW | 9% |
| Monday | 89°F | Mostly Sunny | 10 mph SW | 13% |
| Monday Night | 72°F | Slight Chance Showers And Thunderstorms | 9 mph SSW | 24% |
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 Aug 4, 2026.