Harman US

Chatham, IL Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for Chatham, a village in Sangamon County, Illinois.

This Afternoon
91°F
Cloudy
Cloudy, with a high near 91. Southwest wind around 6 mph.

7-day forecast for Chatham

WhenTempForecastWindPrecip
This Afternoon 91°F Cloudy 6 mph SW 11%
Tonight 70°F Mostly Cloudy 7 mph SSW 6%
Sunday 86°F Slight Chance Rain Showers then Chance Showers And Thunderstorms 6 to 10 mph NNW 39%
Sunday Night 61°F Chance Showers And Thunderstorms 8 to 13 mph NE 64%
Monday 73°F Showers And Thunderstorms Likely 10 mph ENE 65%
Monday Night 56°F Chance Showers And Thunderstorms 7 to 10 mph NE 50%
Tuesday 68°F Chance Rain Showers then Mostly Cloudy 12 mph NE 50%
Tuesday Night 52°F Mostly Cloudy 5 to 10 mph NNE 2%
Wednesday 70°F Partly Sunny 6 to 9 mph NNE 2%
Wednesday Night 54°F Mostly Cloudy 3 to 7 mph NNE 0%
Thursday 74°F Partly Sunny 6 mph NNE 0%
Thursday Night 57°F Mostly Cloudy 5 mph NNE 10%
Friday 76°F Slight Chance Rain Showers 2 to 7 mph NE 15%
Friday Night 56°F Slight Chance Rain Showers then Partly Cloudy 2 to 6 mph NE 15%

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

Nearby towns & communities

All Illinois locations ›

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.