Cornell, IL Weather & Growing Conditions
Today
85°F
Mostly Sunny
Mostly sunny, with a high near 85. South southwest wind 0 to 5 mph, with gusts as high as 15 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 85°F | Mostly Sunny | 0 to 5 mph SSW | 3% |
| Tonight | 67°F | Mostly Cloudy | 0 to 5 mph SSE | 3% |
| Wednesday | 83°F | Chance Showers And Thunderstorms | 0 to 5 mph SW | 50% |
| Wednesday Night | 67°F | Chance Showers And Thunderstorms then Showers And Thunderstorms | 0 to 5 mph WNW | 90% |
| Thursday | 81°F | Showers And Thunderstorms | 0 to 5 mph S | 78% |
| Thursday Night | 64°F | Chance Showers And Thunderstorms then Partly Cloudy | 0 mph | 34% |
| Friday | 84°F | Mostly Sunny | 0 mph | 8% |
| Friday Night | 66°F | Slight Chance Showers And Thunderstorms | 0 mph | 19% |
| Saturday | 86°F | Mostly Sunny | 0 to 5 mph SSW | 11% |
| Saturday Night | 70°F | Mostly Clear | 0 to 5 mph SSW | 11% |
| Sunday | 88°F | Sunny | 5 to 10 mph SSW | 11% |
| Sunday Night | 71°F | Slight Chance Showers And Thunderstorms | 5 to 10 mph SSW | 26% |
| Monday | 88°F | Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms | 5 to 10 mph SSW | 26% |
| Monday Night | 71°F | Chance Showers And Thunderstorms | 5 to 10 mph SW | 35% |
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 Aug 4, 2026.