Chatham, IL Weather & Growing Conditions
This Afternoon
91°F
Mostly Cloudy
Mostly cloudy, with a high near 91. West southwest wind around 7 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 91°F | Mostly Cloudy | 7 mph WSW | 11% |
| Tonight | 70°F | Mostly Cloudy | 7 mph SSW | 5% |
| Sunday | 86°F | Partly Sunny then Chance Showers And Thunderstorms | 6 to 10 mph NNW | 41% |
| Sunday Night | 61°F | Chance Showers And Thunderstorms | 8 to 13 mph NE | 65% |
| Monday | 73°F | Showers And Thunderstorms Likely | 10 mph ENE | 65% |
| Monday Night | 56°F | Chance Rain Showers | 7 to 10 mph NE | 49% |
| Tuesday | 69°F | Chance Rain Showers then Mostly Cloudy | 12 mph NE | 49% |
| Tuesday Night | 52°F | Mostly Cloudy | 5 to 10 mph NNE | 3% |
| 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 | 3 to 7 mph NNE | 0% |
| Thursday Night | 56°F | Mostly Cloudy | 2 to 6 mph NNE | 10% |
| Friday | 77°F | Slight Chance Rain Showers | 2 to 7 mph NE | 15% |
| Friday Night | 55°F | Slight Chance Rain Showers then Partly Cloudy | 2 to 6 mph NE | 15% |
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 Sep 19, 2026.