Chatham, IL Weather & Growing Conditions
Overnight
72°F
Mostly Clear
Mostly clear, with a low around 72. South southeast wind around 6 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 72°F | Mostly Clear | 6 mph SSE | 3% |
| Saturday | 92°F | Partly Sunny | 7 mph SW | 8% |
| Saturday Night | 70°F | Partly Cloudy then Slight Chance Showers And Thunderstorms | 6 mph SSW | 20% |
| Sunday | 85°F | Chance Showers And Thunderstorms | 2 to 8 mph NNW | 44% |
| Sunday Night | 62°F | Chance Showers And Thunderstorms | 8 to 12 mph NE | 70% |
| Monday | 72°F | Showers And Thunderstorms Likely | 12 mph NE | 72% |
| Monday Night | 55°F | Chance Rain Showers | 8 to 12 mph NE | 46% |
| Tuesday | 68°F | Chance Rain Showers | 13 mph NE | 28% |
| Tuesday Night | 52°F | Mostly Cloudy | 5 to 10 mph NNE | 9% |
| Wednesday | 71°F | Mostly Sunny | 9 mph NNE | 2% |
| Wednesday Night | 53°F | Partly Cloudy | 3 to 8 mph NNE | 1% |
| Thursday | 73°F | Mostly Sunny | 5 to 8 mph NNE | 3% |
| Thursday Night | 55°F | Partly Cloudy | 2 to 7 mph NNE | 3% |
| Friday | 76°F | Mostly Sunny | 3 to 8 mph NE | 3% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Chatham, IL
Last spring frost
Apr 15
First fall frost
Oct 22
Growing season
188 days
Hardiness zone
6a
Explore more for Chatham, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Springfield #2, Il (8.5 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.