Winthrop Harbor climate

Winthrop Harbor Weather in September

NOAA 1991-2020 normals for Kenosha, 9.1 km from Winthrop Harbor

Average highs run from 76°F on September 1 to 67°F on September 30, and lows from 61°F to 51°F. Normal precipitation for the month is 3.53 in over about 9 wet days.

September day by day

The normal high and low for each date, and the record, in °F.

Normal daily high and low temperature at Winthrop Harbor, in °F, with the record for each date.20406080100151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

September at a glance

Average high
72°F
Average low
56°F
Precipitation
3.53 in
Record high
96°FSep 10, 2013
Record low
34°FSep 19, 2012
Chance of a freeze
1%
Daylight
13 h 09 min to 11 h 47 min
Cloud cover
59%
Humidity
74%
Dew point
54°F
Wind
9.6 mph

Every day of the month

A wet day has at least 0.01 inch of precipitation; snow means at least 0.1 inch of snowfall.

DateNormal highNormal lowRecord highRecord lowChance wetChance of snow
Sep 176°F61°F93°F 202643°F 200929%0%
Sep 276°F61°F93°F 202644°F 201729%0%
Sep 376°F61°F94°F 202349°F 200929%0%
Sep 476°F60°F91°F 202345°F 200929%0%
Sep 575°F60°F92°F 202345°F 200329%0%
Sep 675°F60°F93°F 201645°F 202529%0%
Sep 775°F59°F88°F 200145°F 202529%0%
Sep 875°F59°F84°F 200245°F 202429%0%
Sep 974°F59°F91°F 201345°F 200829%0%
Sep 1074°F58°F96°F 201343°F 200829%0%
Sep 1174°F58°F91°F 200544°F 201729%0%
Sep 1273°F58°F90°F 200542°F 201429%0%
Sep 1373°F57°F93°F 200539°F 201429%0%
Sep 1473°F57°F86°F 202140°F 201129%0%
Sep 1572°F57°F86°F 200435°F 201229%0%
Sep 1672°F56°F84°F 201641°F 200729%0%
Sep 1772°F56°F91°F 202142°F 201430%0%
Sep 1871°F55°F87°F 200740°F 201230%0%
Sep 1971°F55°F88°F 201634°F 201230%0%
Sep 2071°F55°F89°F 202440°F 200330%0%
Sep 2170°F54°F88°F 201037°F 200630%0%
Sep 2270°F54°F92°F 201740°F 199930%0%
Sep 2369°F53°F88°F 201036°F 201230%0%
Sep 2469°F53°F89°F 200735°F 201230%0%
Sep 2569°F53°F85°F 200738°F 200131%0%
Sep 2668°F52°F90°F 201740°F 200431%0%
Sep 2768°F52°F89°F 202541°F 201231%0%
Sep 2868°F51°F82°F 201339°F 200631%0%
Sep 2967°F51°F88°F 202535°F 201831%0%
Sep 3067°F51°F85°F 201935°F 200431%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Winthrop Harbor, in percent, and of at least 0.1 inch of snowfall.0102030401102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (CDT).

September 1
sunrise 6:16 AM, sunset 7:25 PM
September 30
sunrise 6:47 AM, sunset 6:34 PM

Every day of September: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00474174 (Kenosha), public domain. Records: NOAA GHCN-Daily, station USW00014880, every year on file, quality-flagged values removed. Cloud, humidity, wind and sunshine: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.