Chatham, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Chatham, a village in Sangamon County, Illinois.
Today
92°F
Mostly Cloudy
Mostly cloudy, with a high near 92. Southwest wind around 7 mph.
7-day forecast for Chatham
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 92°F | Mostly Cloudy | 7 mph SW | 8% |
| Tonight | 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 | 47% |
| Tuesday | 68°F | Chance Rain Showers | 13 mph NE | 28% |
| Tuesday Night | 52°F | Mostly Cloudy | 5 to 12 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% |
| Friday Night | 54°F | Partly Cloudy | 3 to 7 mph NE | 2% |
Forecast source: National Weather Service (api.weather.gov) for Chatham (39.675, -89.693). Updated through the day.
Growing snapshot for Chatham
Last spring frost
Apr 15
First fall frost
Oct 22
Growing season
188 days
Hardiness zone
6a
More local growing data for Chatham: nearby ZIP 62629 weather · frost dates · planting calendar · Illinois frost dates
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Climate data from the nearest NOAA station, Springfield #2, Il (8.5 mi from Chatham). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.