Chatham, IL Weather & Growing Conditions
Today
60°F
Slight Chance Drizzle
A slight chance of drizzle. Cloudy, with a high near 60. West southwest wind 12 to 15 mph, with gusts as high as 25 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 60°F | Slight Chance Drizzle | 12 to 15 mph WSW | 11% |
| Tonight | 43°F | Slight Chance Drizzle then Mostly Cloudy | 12 mph WSW | 10% |
| Thursday | 61°F | Partly Sunny | 10 to 15 mph W | 7% |
| Thursday Night | 43°F | Mostly Cloudy | 5 to 8 mph NW | 6% |
| Friday | 54°F | Partly Sunny | 10 mph NNW | 4% |
| Friday Night | 32°F | Partly Cloudy | 1 to 8 mph NNW | 0% |
| Saturday | 54°F | Mostly Sunny | 1 to 5 mph NNW | 0% |
| Saturday Night | 32°F | Partly Cloudy | 2 mph NW | 1% |
| Sunday | 59°F | Sunny | 2 to 7 mph WNW | 1% |
| Sunday Night | 33°F | Clear | 3 mph W | 1% |
| Monday | 64°F | Sunny | 1 to 7 mph SW | 0% |
| Monday Night | 39°F | Clear | 5 mph SW | 0% |
| Tuesday | 67°F | Sunny | 5 mph WNW | 1% |
| Tuesday Night | 39°F | Mostly Clear | 2 mph NNE | 1% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Chatham, IL
Last spring frost
Apr 15
First fall frost
Oct 22
Growing season
188 days
Hardiness zone
6a
Explore more for Chatham, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Springfield #2, Il (8.5 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.