Winnetka, IL Weather & Growing Conditions
Tonight
61°F
Slight Chance Rain Showers then Showers And Thunderstorms Likely
A slight chance of rain showers before 8pm, then showers and thunderstorms likely. Mostly cloudy, with a low around 61. East wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 61°F | Slight Chance Rain Showers then Showers And Thunderstorms Likely | 10 to 15 mph E | 56% |
| Saturday | 74°F | Showers And Thunderstorms Likely | 10 to 15 mph SE | 90% |
| Saturday Night | 63°F | Showers And Thunderstorms Likely then Showers And Thunderstorms | 10 mph ENE | 81% |
| Sunday | 68°F | Showers And Thunderstorms | 15 to 20 mph NNE | 78% |
| Sunday Night | 56°F | Chance Rain Showers | 15 to 20 mph NE | 51% |
| Monday | 65°F | Chance Rain Showers | 15 to 20 mph ENE | 45% |
| Monday Night | 54°F | Chance Rain Showers | 15 to 20 mph ENE | 31% |
| Tuesday | 64°F | Slight Chance Rain Showers | 15 mph NE | 21% |
| Tuesday Night | 54°F | Slight Chance Rain Showers then Mostly Cloudy | 10 to 15 mph NE | 21% |
| Wednesday | 65°F | Mostly Cloudy | 10 mph NE | 12% |
| Wednesday Night | 55°F | Mostly Cloudy | 5 to 10 mph NE | 3% |
| Thursday | 67°F | Partly Sunny | 5 to 10 mph NNE | 7% |
| Thursday Night | 56°F | Mostly Cloudy | 5 to 10 mph NNE | 5% |
| Friday | 68°F | Mostly Sunny | 5 mph NNE | 5% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Winnetka, IL
Last spring frost
Apr 26
First fall frost
Oct 21
Growing season
176 days
Hardiness zone
6a
Explore more for Winnetka, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Chicago Botanic Garden, Il (3 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.