Dunkerton climate

Dunkerton Weather in September

NOAA 1991-2020 normals for Waterloo Muni AP, 19.8 km from Dunkerton

Average highs run from 81°F on September 1 to 71°F on September 30, and lows from 58°F to 47°F. Normal precipitation for the month is 3.14 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 Dunkerton, in °F, with the record for each date.20406080100151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

September at a glance

Average high
77°F
Average low
52°F
Precipitation
3.14 in
Record high
98°FSep 21, 2022
Record low
32°FSep 15, 2011
Chance of a freeze
19%
Days of 90°F or more
1.7
Daylight
13 h 09 min to 11 h 47 min
Cloud cover
49%
Humidity
72%
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 181°F58°F90°F 201244°F 200929%0%
Sep 281°F57°F90°F 201148°F 200929%0%
Sep 381°F57°F88°F 201250°F 200929%0%
Sep 480°F57°F86°F 200743°F 201029%0%
Sep 580°F56°F94°F 201243°F 201029%0%
Sep 680°F56°F89°F 200742°F 201729%0%
Sep 780°F56°F91°F 201643°F 201729%0%
Sep 879°F55°F87°F 201342°F 202429%0%
Sep 979°F55°F85°F 202241°F 200829%0%
Sep 1079°F55°F94°F 201340°F 200829%0%
Sep 1179°F54°F93°F 201344°F 201429%0%
Sep 1278°F54°F89°F 202138°F 200729%0%
Sep 1378°F54°F86°F 202533°F 201429%0%
Sep 1478°F53°F92°F 202534°F 201429%0%
Sep 1577°F53°F91°F 202532°F 201129%0%
Sep 1677°F52°F91°F 201832°F 201129%0%
Sep 1777°F52°F89°F 201840°F 201429%0%
Sep 1876°F52°F92°F 201836°F 201229%0%
Sep 1976°F51°F85°F 202236°F 201229%0%
Sep 2076°F51°F90°F 202133°F 200629%0%
Sep 2175°F50°F98°F 202232°F 200629%0%
Sep 2275°F50°F93°F 201735°F 201229%0%
Sep 2374°F50°F94°F 201732°F 201229%0%
Sep 2474°F49°F93°F 201732°F 201229%0%
Sep 2574°F49°F92°F 201733°F 201229%0%
Sep 2673°F48°F90°F 201740°F 201029%0%
Sep 2773°F48°F86°F 202139°F 201229%0%
Sep 2872°F48°F86°F 202138°F 200629%0%
Sep 2972°F47°F84°F 202536°F 201829%0%
Sep 3071°F47°F88°F 202136°F 201829%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Dunkerton, in percent, and of at least 0.1 inch of snowfall.01020301102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (CDT).

September 1
sunrise 6:34 AM, sunset 7:43 PM
September 30
sunrise 7:05 AM, sunset 6:52 PM

Every day of September: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USW00094910 (Waterloo Muni AP), public domain. Records: NOAA GHCN-Daily, station USC00136199, 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.