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
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| 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
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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.