Walnut, IL Weather & Growing Conditions
Today
58°F
Cloudy then Slight Chance Rain Showers
A slight chance of rain showers between noon and 3pm. Cloudy, with a high near 58. Southwest wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 20%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 58°F | Cloudy then Slight Chance Rain Showers | 15 mph SW | 16% |
| Tonight | 47°F | Mostly Cloudy | 15 mph SW | 14% |
| Thursday | 55°F | Chance Rain Showers | 10 to 15 mph W | 42% |
| Thursday Night | 42°F | Slight Chance Rain Showers then Mostly Cloudy | 10 mph NW | 23% |
| Friday | 50°F | Partly Sunny | 5 to 10 mph N | 4% |
| Friday Night | 32°F | Mostly Clear | 0 to 5 mph N | 0% |
| Saturday | 51°F | Sunny | 0 to 5 mph NW | 0% |
| Saturday Night | 34°F | Mostly Clear | 0 to 5 mph W | 2% |
| Sunday | 56°F | Sunny | 5 to 10 mph W | 3% |
| Sunday Night | 35°F | Clear | 5 mph W | 0% |
| Monday | 62°F | Sunny | 5 to 10 mph SW | 0% |
| Monday Night | 40°F | Mostly Clear | 5 mph W | 0% |
| Tuesday | 62°F | Sunny | 5 mph NW | 0% |
| Tuesday Night | 40°F | Partly Cloudy | 0 mph | 0% |
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 Nov 4, 2026.