Chatham, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Chatham, a village in Sangamon County, Illinois.
Today
87°F
Sunny
Sunny, with a high near 87. South wind around 6 mph.
7-day forecast for Chatham
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 87°F | Sunny | 6 mph S | 0% |
| Tonight | 67°F | Mostly Clear | 6 mph SSE | 1% |
| Wednesday | 88°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 7 mph S | 17% |
| Wednesday Night | 68°F | Chance Showers And Thunderstorms | 6 mph S | 79% |
| Thursday | 83°F | Showers And Thunderstorms | 6 mph SSW | 79% |
| Thursday Night | 66°F | Slight Chance Showers And Thunderstorms | 3 mph SSE | 20% |
| Friday | 85°F | Mostly Sunny | 2 mph SW | 10% |
| Friday Night | 67°F | Chance Showers And Thunderstorms | 2 mph SSW | 25% |
| Saturday | 87°F | Chance Showers And Thunderstorms then Mostly Sunny | 5 mph SSW | 25% |
| Saturday Night | 71°F | Mostly Clear | 3 to 7 mph S | 10% |
| Sunday | 90°F | Sunny | 7 to 10 mph SSW | 4% |
| Sunday Night | 73°F | Mostly Clear | 9 mph S | 9% |
| Monday | 90°F | Mostly Sunny | 9 mph SSW | 12% |
| Monday Night | 73°F | Slight Chance Showers And Thunderstorms | 9 mph SSW | 22% |
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 Aug 4, 2026.