Chatham, IL Weather & Growing Conditions
Overnight
55°F
Slight Chance Light Rain
A slight chance of rain before 5am. Mostly cloudy, with a low around 55. South southwest wind around 13 mph, with gusts as high as 20 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 | 55°F | Slight Chance Light Rain | 13 mph SSW | 20% |
| Wednesday | 59°F | Patchy Drizzle | 12 to 15 mph WSW | 11% |
| Wednesday Night | 45°F | Patchy 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% |
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.