Chatham, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Chatham, a village in Sangamon County, Illinois.
Tonight
52°F
Light Rain then Rain Showers Likely
Rain and a slight chance of thunderstorms before midnight, then rain showers likely between midnight and 5am. Cloudy. Low around 52, with temperatures rising to around 57 overnight. South wind 12 to 18 mph, with gusts as high as 26 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.
7-day forecast for Chatham
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 52°F | Light Rain then Rain Showers Likely | 12 to 18 mph S | 94% |
| Wednesday | 60°F | Mostly Cloudy | 12 to 15 mph SW | 10% |
| Wednesday Night | 43°F | Mostly Cloudy | 9 mph SW | 1% |
| Thursday | 62°F | Mostly Sunny | 8 to 13 mph WSW | 4% |
| Thursday Night | 41°F | Mostly Cloudy then Slight Chance Light Rain | 6 mph NW | 22% |
| Friday | 56°F | Mostly Cloudy | 6 to 10 mph NNW | 12% |
| Friday Night | 36°F | Mostly Cloudy | 1 to 8 mph NNW | 3% |
| Saturday | 54°F | Mostly Sunny | 3 mph NW | 1% |
| Saturday Night | 34°F | Partly Cloudy | 2 mph W | 1% |
| Sunday | 60°F | Sunny | 2 to 8 mph W | 7% |
| Sunday Night | 34°F | Mostly Clear | 2 to 6 mph WNW | 4% |
| Monday | 64°F | Sunny | 2 to 9 mph SW | 2% |
| Monday Night | 39°F | Mostly Clear | 6 mph WSW | 1% |
| Tuesday | 67°F | Sunny | 6 mph WNW | 0% |
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 Nov 4, 2026.