Oak Brook, IL Weather & Growing Conditions
This Afternoon
72°F
Chance Rain
A chance of rain before 3pm, then a chance of rain and a slight chance of thunderstorms. Mostly cloudy. High near 72, with temperatures falling to around 69 in the afternoon. South wind 15 to 20 mph, with gusts as high as 35 mph. Chance of precipitation is 40%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 72°F | Chance Rain | 15 to 20 mph S | 39% |
| Tonight | 61°F | Rain | 15 mph S | 85% |
| Wednesday | 64°F | Rain Likely | 15 mph SSW | 59% |
| Wednesday Night | 49°F | Slight Chance Rain then Mostly Cloudy | 15 mph SW | 15% |
| Thursday | 58°F | Chance Rain | 10 to 15 mph WSW | 27% |
| Thursday Night | 44°F | Chance Rain | 5 to 10 mph WNW | 45% |
| Friday | 53°F | Chance Rain | 10 to 15 mph N | 30% |
| Friday Night | 39°F | Mostly Cloudy | 5 to 10 mph NNW | 11% |
| Saturday | 52°F | Mostly Sunny | 5 mph WNW | 9% |
| Saturday Night | 37°F | Partly Cloudy | 5 mph WSW | 6% |
| Sunday | 57°F | Mostly Sunny then Slight Chance Rain | 5 to 10 mph W | 15% |
| Sunday Night | 39°F | Mostly Clear | 5 to 10 mph WNW | 9% |
| Monday | 60°F | Sunny | 5 to 15 mph WSW | 4% |
| Monday Night | 43°F | Mostly Clear | 5 to 10 mph W | 2% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Oak Brook, IL
Last spring frost
Apr 28
First fall frost
Oct 16
Growing season
169 days
Hardiness zone
6a
Explore more for Oak Brook, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Lisle-Morton Arboretum, Il (6.4 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 3, 2026.