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Weather in Winthrop Harbor, IL · National Weather Service + NOAA

Winthrop Harbor is snow country

Winthrop Harbor has chilly, snowy winters and pleasant summers. A typical July afternoon reaches 81°, a January night drops to 17°, and about 36 inches of snow falls in a normal winter. Normal November highs come to 48°, and lows to 33°.

Winter 34°/20°Spring 55°/38°Summer 79°/62°Fall 61°/45°
Right now
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Sunrise 7:27 am · sunset 5:42 pm

Getting the latest forecast from the National Weather Service…

What stands out about Winthrop Harbor’s weather

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

Climate →
Snow countryAbout 36 inches a winter, more than 2,654 of 2,880 Illinois towns.Cool summersJuly afternoons average 81°, cooler than 2,885 of 2,886 Illinois towns.The mildest winters aroundMilder January nights than all 4 towns around it.Drier than most of Illinois36 inches of rain and melted snow a year, less than 2,885 of 2,886 Illinois towns.
A normal year

Where today sits in Winthrop Harbor’s year

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

Full climate →
Winter
34° / 20°
12 days with an inch or more of snow
Spring
55° / 38°
Last frost around Apr 19
Summer
79° / 62°
7 days reach 90° in a normal year
Fall now
61° / 45°
First frost around Oct 26
Pastthe usual first frost (Oct 26). Last frost next spring: Apr 19
Best months to be outside
MayJunJulAugSep
Highs of 62–84° and lows of 40° or more
How much snow does Winthrop Harbor get?About 36 inches a winter.When is it wettest?June, with 4.2 inches.Is it warmer than it used to be?+0.9° vs. the 20th century.

Weather talk

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

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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 Winthrop Harbor itself (about a 3-mile square). Snow, frost dates and day counts: the NOAA station at Kenosha, WI (6 mi). Sunrise and sunset are calculated from the town’s position. Normals are 30-year averages, not a forecast.