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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

WhenTempForecastWindPrecip
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.