Cooper County climate

Cooper County Weather in September

NOAA 1991-2020 normals for Boonville, 14.7 km from Cooper County

Average highs run from 85°F on September 1 to 75°F on September 30, and lows from 64°F to 52°F. Normal precipitation for the month is 3.90 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 Cooper County, in °F, with the record for each date.20406080100120151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

September at a glance

Average high
80°F
Average low
58°F
Precipitation
3.90 in
Record high
100°FSep 6, 2026
Record low
36°FSep 23, 2012
Chance of a freeze
0%
Days of 90°F or more
5.5
Daylight
13 h 01 min to 11 h 49 min
Cloud cover
46%
Humidity
69%
Dew point
56°F
Wind
8.5 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 185°F64°F98°F 202656°F 201725%0%
Sep 285°F64°F97°F 201150°F 201725%0%
Sep 384°F63°F97°F 202650°F 201725%0%
Sep 484°F63°F97°F 202649°F 201025%0%
Sep 584°F63°F97°F 202350°F 201026%0%
Sep 683°F62°F100°F 202648°F 201126%0%
Sep 783°F62°F94°F 201545°F 201726%0%
Sep 883°F62°F95°F 201345°F 201726%0%
Sep 983°F61°F97°F 202646°F 201126%0%
Sep 1082°F61°F97°F 201349°F 202426%0%
Sep 1182°F60°F96°F 201350°F 201227%0%
Sep 1282°F60°F95°F 201349°F 201727%0%
Sep 1381°F59°F96°F 202540°F 201427%0%
Sep 1481°F59°F96°F 202540°F 201427%0%
Sep 1581°F59°F94°F 202541°F 201127%0%
Sep 1680°F58°F93°F 202641°F 201128%0%
Sep 1780°F58°F92°F 201951°F 201128%0%
Sep 1879°F57°F95°F 202647°F 201228%0%
Sep 1979°F57°F91°F 201846°F 201228%0%
Sep 2079°F56°F95°F 202248°F 201529%0%
Sep 2178°F56°F96°F 202247°F 201529%0%
Sep 2278°F56°F91°F 201745°F 201329%0%
Sep 2378°F55°F91°F 201736°F 201229%0%
Sep 2477°F55°F91°F 201736°F 201229%0%
Sep 2577°F54°F89°F 201639°F 201129%0%
Sep 2677°F54°F90°F 202339°F 201129%0%
Sep 2776°F53°F88°F 202343°F 201029%0%
Sep 2876°F53°F90°F 201943°F 201029%0%
Sep 2976°F52°F89°F 202137°F 202229%0%
Sep 3075°F52°F94°F 202344°F 202229%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Cooper 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 6:40 AM, sunset 7:41 PM
September 30
sunrise 7:06 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 USC00230817 (Boonville), public domain. Records: NOAA GHCN-Daily, station USC00230824, 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.