Walnut, IL Weather & Growing Conditions
Overnight
66°F
Patchy Fog
Patchy fog and a chance of showers and thunderstorms. Mostly cloudy. Low around 66, with temperatures rising to around 68 overnight. Southeast wind around 10 mph. Chance of precipitation is 50%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 66°F | Patchy Fog | 10 mph SE | 46% |
| Saturday | 80°F | Patchy Fog | 5 to 10 mph SE | 84% |
| Saturday Night | 65°F | Chance Showers And Thunderstorms then Showers And Thunderstorms | 5 to 10 mph W | 96% |
| Sunday | 71°F | Patchy Fog | 10 to 15 mph NE | 77% |
| Sunday Night | 57°F | Chance Rain Showers | 15 mph NE | 44% |
| Monday | 65°F | Chance Rain Showers | 15 mph NE | 54% |
| Monday Night | 52°F | Chance Rain Showers | 10 to 15 mph NE | 35% |
| Tuesday | 63°F | Slight Chance Rain Showers | 15 mph NE | 19% |
| Tuesday Night | 50°F | Partly Cloudy | 5 to 15 mph NE | 9% |
| Wednesday | 67°F | Mostly Sunny | 10 mph NE | 2% |
| Wednesday Night | 52°F | Partly Cloudy | 5 to 10 mph NE | 1% |
| Thursday | 68°F | Mostly Sunny | 5 mph NE | 5% |
| Thursday Night | 53°F | Partly Cloudy | 5 mph NE | 5% |
| Friday | 72°F | Mostly Sunny | 5 mph NE | 2% |
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 Sep 19, 2026.