Harwood Heights, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Harwood Heights, a village in Cook County, Illinois.
Today
85°F
Mostly Sunny
Mostly sunny, with a high near 85. South southwest wind 5 to 10 mph.
7-day forecast for Harwood Heights
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 85°F | Mostly Sunny | 5 to 10 mph SSW | 1% |
| Tonight | 69°F | Mostly Cloudy then Slight Chance Showers And Thunderstorms | 5 mph SSW | 24% |
| Wednesday | 80°F | Showers And Thunderstorms Likely then Slight Chance Showers And Thunderstorms | 5 mph WSW | 70% |
| Wednesday Night | 66°F | Showers And Thunderstorms | 0 to 5 mph WNW | 90% |
| Thursday | 78°F | Rain Showers Likely | 0 to 5 mph NNE | 69% |
| Thursday Night | 64°F | Chance Showers And Thunderstorms then Partly Cloudy | 0 to 5 mph SSE | 25% |
| Friday | 82°F | Mostly Sunny | 0 to 5 mph SE | 4% |
| Friday Night | 66°F | Mostly Clear | 0 to 5 mph SSE | 8% |
| Saturday | 85°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 5 to 10 mph SW | 15% |
| Saturday Night | 70°F | Slight Chance Showers And Thunderstorms | 5 mph SSW | 20% |
| Sunday | 86°F | Slight Chance Showers And Thunderstorms | 5 to 15 mph SW | 20% |
| Sunday Night | 71°F | Chance Showers And Thunderstorms | 5 to 10 mph SW | 45% |
| Monday | 85°F | Chance Showers And Thunderstorms | 5 to 10 mph SSW | 45% |
| Monday Night | 70°F | Chance Showers And Thunderstorms | 5 to 10 mph SW | 48% |
Forecast source: National Weather Service (api.weather.gov) for Harwood Heights (41.966, -87.806). Updated through the day.
Growing snapshot for Harwood Heights
Last spring frost
Apr 16
First fall frost
Oct 28
Growing season
193 days
Hardiness zone
6a
More local growing data for Harwood Heights: nearby ZIP 60706 weather · frost dates · planting calendar · Illinois frost dates
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Climate data from the nearest NOAA station, Chicago Ohare Intl Ap, Il (6.4 mi from Harwood Heights). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.