Chatham, IL Weather & Growing Conditions
Overnight
54°F
Slight Chance Light Rain
A slight chance of rain. Mostly cloudy, with a low around 54. South southwest wind around 13 mph, with gusts as high as 21 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 54°F | Slight Chance Light Rain | 13 mph SSW | 21% |
| Wednesday | 59°F | Patchy Drizzle | 12 to 15 mph WSW | 12% |
| Wednesday Night | 45°F | Patchy Drizzle then Mostly Cloudy | 12 mph WSW | 10% |
| Thursday | 62°F | Partly Sunny | 10 to 15 mph W | 5% |
| Thursday Night | 43°F | Mostly Cloudy | 7 mph NW | 4% |
| Friday | 55°F | Partly Sunny | 10 mph NNW | 3% |
| 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 | 58°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% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Chatham, IL
Last spring frost
Apr 7
First fall frost
Oct 29
Growing season
205 days
Hardiness zone
6a
Explore more for Chatham, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Virden, Il (10.5 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.