Mukwonago climate

Mukwonago Weather in September

NOAA 1991-2020 normals for Waukesha Wwtp, 16.9 km from Mukwonago

Average highs run from 78°F on September 1 to 67°F on September 30, and lows from 56°F to 45°F. Normal precipitation for the month is 3.27 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 Mukwonago, in °F, with the record for each date.20406080100151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

September at a glance

Average high
73°F
Average low
51°F
Precipitation
3.27 in
Record high
93°FSep 23, 2017
Record low
32°FSep 24, 2012
Chance of a freeze
14%
Days of 90°F or more
0.8
Daylight
13 h 10 min to 11 h 46 min
Cloud cover
53%
Humidity
74%
Dew point
53°F
Wind
9.4 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 178°F56°F92°F 201244°F 202329%0%
Sep 278°F56°F91°F 201142°F 201729%0%
Sep 377°F56°F91°F 202646°F 202029%0%
Sep 477°F56°F92°F 201841°F 202529%0%
Sep 577°F55°F92°F 201841°F 202529%0%
Sep 676°F55°F87°F 201542°F 201129%0%
Sep 776°F55°F90°F 201641°F 202529%0%
Sep 876°F54°F85°F 201639°F 202529%0%
Sep 976°F54°F82°F 201639°F 202529%0%
Sep 1075°F53°F89°F 201341°F 201729%0%
Sep 1175°F53°F92°F 201342°F 201729%0%
Sep 1275°F53°F85°F 201941°F 201730%0%
Sep 1374°F52°F87°F 202438°F 201430%0%
Sep 1474°F52°F86°F 202439°F 201330%0%
Sep 1573°F51°F86°F 202435°F 201130%0%
Sep 1673°F51°F86°F 202434°F 201130%0%
Sep 1773°F51°F89°F 202439°F 201130%0%
Sep 1872°F50°F88°F 201838°F 201430%0%
Sep 1972°F50°F85°F 202433°F 201230%0%
Sep 2071°F49°F88°F 202433°F 201230%0%
Sep 2171°F49°F89°F 201741°F 201230%0%
Sep 2271°F49°F91°F 201739°F 201230%0%
Sep 2370°F48°F93°F 201734°F 201230%0%
Sep 2470°F48°F92°F 201732°F 201230%0%
Sep 2569°F47°F89°F 201732°F 201230%0%
Sep 2669°F47°F88°F 201743°F 201331%0%
Sep 2768°F47°F91°F 201736°F 201231%0%
Sep 2868°F46°F84°F 202140°F 201231%0%
Sep 2968°F46°F80°F 201333°F 202231%0%
Sep 3067°F45°F87°F 202533°F 202231%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Mukwonago, 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 6:18 AM, sunset 7:28 PM
September 30
sunrise 6:50 AM, sunset 6:36 PM

Every day of September: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00478937 (Waukesha Wwtp), public domain. Records: NOAA GHCN-Daily, station USC00477314, 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.