Oak Brook, IL Weather & Growing Conditions
Today
86°F
Mostly Sunny
Mostly sunny, with a high near 86. South southwest wind 5 to 10 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 86°F | Mostly Sunny | 5 to 10 mph SSW | 3% |
| Tonight | 69°F | Mostly Cloudy then Slight Chance Showers And Thunderstorms | 5 to 10 mph SSW | 24% |
| Wednesday | 81°F | Showers And Thunderstorms Likely then Slight Chance Showers And Thunderstorms | 5 mph WSW | 69% |
| Wednesday Night | 66°F | Showers And Thunderstorms | 5 mph W | 90% |
| Thursday | 79°F | Rain Showers Likely | 0 to 5 mph NE | 70% |
| Thursday Night | 64°F | Chance Showers And Thunderstorms then Partly Cloudy | 0 to 5 mph SSE | 26% |
| Friday | 83°F | Mostly Sunny | 0 to 5 mph S | 4% |
| Friday Night | 66°F | Mostly Clear | 0 to 5 mph S | 8% |
| Saturday | 85°F | Mostly Sunny | 5 to 10 mph SSW | 9% |
| Saturday Night | 70°F | Partly Cloudy then Slight Chance Showers And Thunderstorms | 5 to 10 mph SSW | 18% |
| Sunday | 86°F | Slight Chance Showers And Thunderstorms then Mostly Sunny | 10 to 15 mph SW | 18% |
| Sunday Night | 71°F | Chance Showers And Thunderstorms | 5 to 15 mph SSW | 42% |
| Monday | 86°F | Chance Showers And Thunderstorms | 5 to 10 mph SW | 42% |
| Monday Night | 70°F | Chance Showers And Thunderstorms | 10 mph SW | 46% |
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 Aug 4, 2026.