Cornell, IL Weather & Growing Conditions
Tonight
58°F
Rain Showers
Rain showers. Cloudy. Low around 58, with temperatures rising to around 61 overnight. South wind around 15 mph, with gusts as high as 30 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 58°F | Rain Showers | 15 mph S | 90% |
| Wednesday | 62°F | Chance Rain Showers then Mostly Cloudy | 15 mph SW | 33% |
| Wednesday Night | 47°F | Mostly Cloudy | 10 mph SW | 8% |
| Thursday | 60°F | Mostly Cloudy | 10 to 15 mph WSW | 10% |
| Thursday Night | 43°F | Chance Rain Showers | 5 mph NW | 31% |
| Friday | 55°F | Slight Chance Rain Showers | 5 to 10 mph N | 22% |
| Friday Night | 35°F | Partly Cloudy | 0 to 10 mph NNW | 4% |
| Saturday | 54°F | Mostly Sunny | 0 to 5 mph WNW | 3% |
| Saturday Night | 34°F | Partly Cloudy | 0 mph | 2% |
| Sunday | 60°F | Sunny | 0 to 10 mph W | 12% |
| Sunday Night | 34°F | Mostly Clear | 0 to 5 mph W | 7% |
| Monday | 64°F | Sunny | 0 to 10 mph WSW | 3% |
| Monday Night | 39°F | Mostly Clear | 5 mph WSW | 2% |
| Tuesday | 66°F | Sunny | 5 mph WNW | 0% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Cornell, IL
Last spring frost
Apr 12
First fall frost
Oct 28
Growing season
199 days
Hardiness zone
5b
Explore more for Cornell, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Streator 3 Se, Il (6.5 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.