Marshall County climate

Marshall County Weather in September

NOAA 1991-2020 normals for Marshalltown, 6.9 km from Marshall County

Average highs run from 79°F on September 1 to 70°F on September 30, and lows from 56°F to 45°F. Normal precipitation for the month is 3.85 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 Marshall County, in °F, with the record for each date.20406080100120151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

September at a glance

Average high
75°F
Average low
51°F
Precipitation
3.85 in
Record high
100°FSep 9, 2013
Record low
27°FSep 23, 2012
Chance of a freeze
29%
Days of 90°F or more
1.4
Daylight
13 h 07 min to 11 h 47 min
Cloud cover
49%
Humidity
71%
Dew point
53°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 179°F56°F94°F 201143°F 200929%0%
Sep 279°F56°F99°F 199947°F 200929%0%
Sep 379°F55°F96°F 202344°F 201329%0%
Sep 479°F55°F96°F 202340°F 202529%0%
Sep 579°F55°F92°F 202343°F 200829%0%
Sep 678°F54°F91°F 199840°F 202529%0%
Sep 778°F54°F92°F 201338°F 202529%0%
Sep 878°F54°F91°F 200244°F 200829%0%
Sep 978°F53°F100°F 201339°F 200829%0%
Sep 1077°F53°F97°F 201342°F 199929%0%
Sep 1177°F52°F96°F 200040°F 200729%0%
Sep 1277°F52°F92°F 199836°F 200728%0%
Sep 1377°F52°F95°F 202534°F 201428%0%
Sep 1476°F51°F94°F 202535°F 200728%0%
Sep 1576°F51°F91°F 201730°F 200728%0%
Sep 1676°F51°F90°F 202535°F 199928%0%
Sep 1775°F50°F90°F 201836°F 199928%0%
Sep 1875°F50°F89°F 201337°F 201228%0%
Sep 1975°F49°F89°F 202137°F 200628%0%
Sep 2074°F49°F95°F 202232°F 200628%0%
Sep 2174°F49°F91°F 200530°F 199928%0%
Sep 2274°F48°F91°F 201735°F 201228%0%
Sep 2373°F48°F92°F 201727°F 201228%0%
Sep 2473°F47°F91°F 201731°F 200228%0%
Sep 2572°F47°F89°F 201732°F 200128%0%
Sep 2672°F47°F89°F 199832°F 200128%0%
Sep 2772°F46°F91°F 202136°F 200128%0%
Sep 2871°F46°F86°F 202430°F 202228%0%
Sep 2971°F45°F88°F 200230°F 200328%0%
Sep 3070°F45°F93°F 202329°F 200328%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Marshall County, 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 6:38 AM, sunset 7:45 PM
September 30
sunrise 7:08 AM, sunset 6:55 PM

Every day of September: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00135198 (Marshalltown), public domain. Records: NOAA GHCN-Daily, station USW00094988, 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.