Shell Rock climate

Shell Rock Weather in September

NOAA 1991-2020 normals for Allison, 18.5 km from Shell Rock

Average highs run from 78°F on September 1 to 69°F on September 30, and lows from 56°F to 46°F. Normal precipitation for the month is 3.37 in over about 8 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 Shell Rock, in °F, with the record for each date.20406080100120151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

September at a glance

Average high
74°F
Average low
51°F
Precipitation
3.37 in
Record high
100°FSep 3, 2023
Record low
22°FSep 29, 1967
Chance of a freeze
24%
Days of 90°F or more
1.0
Daylight
13 h 10 min to 11 h 46 min
Cloud cover
49%
Humidity
72%
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 178°F56°F97°F 198436°F 196724%0%
Sep 278°F56°F98°F 202338°F 196725%0%
Sep 378°F56°F100°F 202336°F 197425%0%
Sep 478°F55°F100°F 202334°F 197425%0%
Sep 577°F55°F93°F 196037°F 197425%0%
Sep 677°F55°F94°F 196035°F 198825%0%
Sep 777°F54°F95°F 197837°F 195625%0%
Sep 877°F54°F95°F 197835°F 198625%0%
Sep 976°F54°F99°F 201337°F 196925%0%
Sep 1076°F53°F97°F 201335°F 197625%0%
Sep 1176°F53°F98°F 200034°F 195526%0%
Sep 1276°F53°F94°F 199832°F 195526%0%
Sep 1375°F52°F95°F 202531°F 197526%0%
Sep 1475°F52°F94°F 199434°F 199626%0%
Sep 1575°F52°F95°F 195530°F 200726%0%
Sep 1675°F51°F92°F 195531°F 198426%0%
Sep 1774°F51°F95°F 198835°F 198026%0%
Sep 1874°F50°F93°F 195535°F 197326%0%
Sep 1974°F50°F91°F 198432°F 199126%0%
Sep 2073°F50°F96°F 202227°F 199126%0%
Sep 2173°F49°F93°F 202431°F 197427%0%
Sep 2273°F49°F93°F 201726°F 197427%0%
Sep 2372°F48°F92°F 201728°F 198326%0%
Sep 2472°F48°F91°F 198429°F 198926%0%
Sep 2571°F48°F89°F 201731°F 197526%0%
Sep 2671°F47°F89°F 202526°F 198426%0%
Sep 2771°F47°F89°F 195432°F 197526%0%
Sep 2870°F47°F91°F 195328°F 196726%0%
Sep 2970°F46°F90°F 195322°F 196726%0%
Sep 3069°F46°F94°F 202327°F 198426%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Shell Rock, 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 6:35 AM, sunset 7:45 PM
September 30
sunrise 7:07 AM, sunset 6:53 PM

Every day of September: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00130157 (Allison), public domain. Records: NOAA GHCN-Daily, station USW00094910, 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.