Willowbrook, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Willowbrook, a community in Lake County, Illinois.
Overnight
61°F
Rain Showers
Rain showers. Cloudy. Low around 61, with temperatures rising to around 63 overnight. South wind around 15 mph, with gusts as high as 30 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for Willowbrook
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 61°F | Rain Showers | 15 mph S | 81% |
| Wednesday | 65°F | Chance Rain Showers | 15 mph SW | 46% |
| Wednesday Night | 47°F | Mostly Cloudy | 15 mph SW | 9% |
| Thursday | 57°F | Mostly Cloudy then Chance Rain Showers | 10 to 15 mph WSW | 33% |
| Thursday Night | 42°F | Rain Showers Likely | 10 mph NW | 61% |
| Friday | 51°F | Chance Rain Showers then Mostly Cloudy | 10 to 15 mph NNW | 27% |
| Friday Night | 36°F | Partly Cloudy | 5 to 10 mph NW | 8% |
| Saturday | 51°F | Mostly Sunny | 5 mph NW | 2% |
| Saturday Night | 33°F | Partly Cloudy | 0 to 5 mph WNW | 0% |
| Sunday | 54°F | Sunny | 5 to 10 mph W | 5% |
| Sunday Night | 34°F | Mostly Clear | 5 mph W | 2% |
| Monday | 60°F | Sunny | 5 to 10 mph SW | 1% |
| Monday Night | 39°F | Mostly Clear | 5 mph WSW | 1% |
| Tuesday | 62°F | Sunny | 5 mph WNW | 0% |
Forecast source: National Weather Service (api.weather.gov) for Willowbrook (41.448, -87.532). Updated through the day.
Growing snapshot for Willowbrook
Last spring frost
Apr 23
First fall frost
Oct 20
Growing season
179 days
Hardiness zone
6a
More local growing data for Willowbrook: nearby ZIP 46311 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Park Forest, Il (9 mi from Willowbrook). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.