Walnut, IL Weather & Growing Conditions
Overnight
63°F
Mostly Clear
Mostly clear, with a low around 63. South wind around 5 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 63°F | Mostly Clear | 5 mph S | 0% |
| Tuesday | 86°F | Mostly Sunny | 5 to 10 mph SW | 2% |
| Tuesday Night | 68°F | Showers And Thunderstorms Likely | 5 mph S | 65% |
| Wednesday | 78°F | Showers And Thunderstorms Likely | 5 mph W | 75% |
| Wednesday Night | 64°F | Showers And Thunderstorms | 0 to 5 mph NE | 84% |
| Thursday | 78°F | Slight Chance Showers And Thunderstorms | 5 mph NE | 54% |
| Thursday Night | 62°F | Slight Chance Showers And Thunderstorms then Mostly Clear | 0 mph | 18% |
| Friday | 81°F | Mostly Sunny | 0 to 5 mph SE | 5% |
| Friday Night | 65°F | Mostly Clear | 0 to 5 mph S | 7% |
| Saturday | 84°F | Sunny | 5 to 10 mph SW | 9% |
| Saturday Night | 70°F | Mostly Clear then Slight Chance Showers And Thunderstorms | 5 to 10 mph S | 16% |
| Sunday | 86°F | Slight Chance Showers And Thunderstorms then Mostly Sunny | 10 to 15 mph SW | 16% |
| Sunday Night | 70°F | Chance Showers And Thunderstorms | 5 to 10 mph S | 34% |
| Monday | 85°F | Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms | 5 to 10 mph S | 34% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Walnut, IL
Last spring frost
Apr 24
First fall frost
Oct 14
Growing season
172 days
Hardiness zone
5b
Explore more for Walnut, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Walnut, Il (1.5 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.