Winnetka, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Winnetka, a village in Cook County, Illinois.
Tonight
60°F
Rain Showers Likely
Rain showers likely. Mostly cloudy. Low around 60, with temperatures rising to around 62 overnight. South southeast wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 70%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Winnetka
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 60°F | Rain Showers Likely | 15 mph SSE | 73% |
| Wednesday | 64°F | Rain Showers Likely | 15 mph SSW | 64% |
| Wednesday Night | 49°F | Slight Chance Rain Showers then Mostly Cloudy | 15 mph SW | 15% |
| Thursday | 56°F | Chance Rain Showers | 10 to 15 mph WSW | 29% |
| Thursday Night | 44°F | Rain Showers Likely | 5 to 15 mph WNW | 61% |
| Friday | 52°F | Chance Rain Showers | 15 mph N | 42% |
| Friday Night | 40°F | Slight Chance Rain then Mostly Cloudy | 5 to 15 mph NNW | 18% |
| Saturday | 52°F | Mostly Sunny | 5 mph WNW | 11% |
| Saturday Night | 39°F | Partly Cloudy | 5 mph WSW | 7% |
| Sunday | 56°F | Mostly Sunny then Slight Chance Rain | 5 to 10 mph W | 17% |
| Sunday Night | 40°F | Mostly Clear | 5 to 10 mph WNW | 11% |
| Monday | 58°F | Sunny | 5 to 15 mph W | 7% |
| Monday Night | 44°F | Mostly Clear | 10 mph W | 3% |
| Tuesday | 59°F | Mostly Sunny | 5 to 10 mph WNW | 1% |
Forecast source: National Weather Service (api.weather.gov) for Winnetka (42.106, -87.743). Updated through the day.
Growing snapshot for Winnetka
Last spring frost
Apr 26
First fall frost
Oct 21
Growing season
176 days
Hardiness zone
6a
More local growing data for Winnetka: nearby ZIP 60093 weather · frost dates · planting calendar · Illinois frost dates
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Climate data from the nearest NOAA station, Chicago Botanic Garden, Il (3 mi from Winnetka). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.