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Weather in Winnetka, IL · National Weather Service + NOAA

Winnetka stays cool in summer

Winnetka has chilly, snowy winters and pleasant summers. A typical July afternoon reaches 82°, a January night drops to 18°, and about 34 inches of snow falls in a normal winter. In November, a normal day reaches 48° and a normal night drops to 34°.

Winter 35°/21°Spring 56°/39°Summer 80°/63°Fall 61°/45°
Right now
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Sunrise 6:25 am · sunset 4:43 pm

Getting the latest forecast from the National Weather Service…

What stands out about Winnetka’s weather

Read from 30 years of NOAA records. Each one opens the full story on the Climate page.

Climate →
Cool summersJuly afternoons average 82°, cooler than 2,848 of 2,886 Illinois towns.The mildest winters aroundMilder January nights than all 4 towns around it.
A normal year

Where today sits in Winnetka’s year

Typical highs and lows month by month, from 30 years of NOAA records.

Full climate →
Winter
35° / 21°
12 days with an inch or more of snow
Spring
56° / 39°
Last frost around Apr 26
Summer
80° / 63°
17 days reach 90° in a normal year
Fall now
61° / 45°
First frost around Oct 21
Pastthe usual first frost (Oct 21). Last frost next spring: Apr 26
Best months to be outside
MayJunJulAugSep
Highs of 62–84° and lows of 40° or more
How much snow does Winnetka get?About 34 inches a winter.When is it wettest?May, with 4.5 inches.Is it warmer than it used to be?+1.4° vs. the 20th century.

Weather talk

Road reports, first frosts and storm memories from neighbors in Winnetka.

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Forecast, conditions and alerts: National Weather Service. Climate: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000. Temperatures and rainfall come from NOAA’s gridded normals for Winnetka itself (about a 3-mile square). Snow, frost dates and day counts: the NOAA station at Chicago Botanic Garden, IL (3 mi). Sunrise and sunset are calculated from the town’s position. Normals are 30-year averages, not a forecast.