Clarendon Hills, IL Weather & Growing Conditions
Today
85°F
Mostly Sunny
Mostly sunny, with a high near 85. Southwest wind around 10 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 85°F | Mostly Sunny | 10 mph SW | 0% |
| Tonight | 69°F | Mostly Cloudy then Slight Chance Showers And Thunderstorms | 5 mph SSW | 23% |
| Wednesday | 81°F | Showers And Thunderstorms Likely then Slight Chance Showers And Thunderstorms | 5 mph SW | 69% |
| Wednesday Night | 66°F | Showers And Thunderstorms | 5 mph W | 90% |
| Thursday | 79°F | Rain Showers Likely | 5 mph ENE | 71% |
| Thursday Night | 64°F | Chance Showers And Thunderstorms then Partly Cloudy | 0 to 5 mph SSE | 26% |
| Friday | 82°F | Mostly Sunny | 0 to 5 mph SSW | 4% |
| Friday Night | 66°F | Mostly Clear | 0 to 5 mph SSW | 8% |
| Saturday | 84°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 | 70°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 WSW | 46% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Clarendon Hills, IL
Last spring frost
Apr 28
First fall frost
Oct 16
Growing season
169 days
Hardiness zone
6a
Explore more for Clarendon Hills, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Lisle-Morton Arboretum, Il (5.8 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.