Clark County climate

Clark County Weather in September

NOAA 1991-2020 normals for Casey, 16.6 km from Clark County

Average highs run from 84°F on September 1 to 77°F on September 30, and lows from 60°F to 51°F. Normal precipitation for the month is 3.07 in over about 7 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 Clark County, in °F, with the record for each date.20406080100120151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

September at a glance

Average high
81°F
Average low
55°F
Precipitation
3.07 in
Record high
107°FSep 2, 1953
Record low
26°FSep 26, 1928
Chance of a freeze
4%
Days of 90°F or more
7.7
Daylight
13 h 02 min to 11 h 49 min
Cloud cover
46%
Humidity
68%
Dew point
55°F
Wind
8.3 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 184°F60°F106°F 195345°F 194921%0%
Sep 284°F60°F107°F 195345°F 194921%0%
Sep 384°F59°F105°F 192539°F 190821%0%
Sep 483°F59°F107°F 195443°F 199721%0%
Sep 583°F59°F107°F 195441°F 199721%0%
Sep 683°F59°F106°F 192538°F 198821%0%
Sep 783°F58°F102°F 193939°F 198821%0%
Sep 883°F58°F104°F 193936°F 195621%0%
Sep 983°F58°F103°F 193940°F 195621%0%
Sep 1082°F57°F99°F 193331°F 198821%0%
Sep 1182°F57°F100°F 193340°F 191721%0%
Sep 1282°F57°F100°F 199138°F 195521%0%
Sep 1382°F56°F104°F 193934°F 195322%0%
Sep 1482°F56°F103°F 193935°F 190222%0%
Sep 1581°F56°F102°F 192739°F 192322%0%
Sep 1681°F55°F100°F 192735°F 191622%0%
Sep 1781°F55°F102°F 192736°F 193722%0%
Sep 1881°F55°F102°F 195335°F 190122%0%
Sep 1980°F54°F98°F 192532°F 190122%0%
Sep 2080°F54°F97°F 194033°F 199123%0%
Sep 2180°F54°F99°F 195535°F 190123%0%
Sep 2279°F53°F97°F 200530°F 199923%0%
Sep 2379°F53°F95°F 200531°F 199523%0%
Sep 2479°F53°F94°F 193928°F 192823%0%
Sep 2578°F52°F93°F 193934°F 194223%0%
Sep 2678°F52°F94°F 189726°F 192824%0%
Sep 2778°F52°F93°F 199831°F 189924%0%
Sep 2877°F51°F97°F 193926°F 194224%0%
Sep 2977°F51°F104°F 195329°F 194224%0%
Sep 3077°F51°F92°F 195228°F 189924%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Clark County, in percent, and of at least 0.1 inch of snowfall.05101520251102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (CDT).

September 1
sunrise 6:20 AM, sunset 7:22 PM
September 30
sunrise 6:46 AM, sunset 6:35 PM

Every day of September: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00111329 (Casey), public domain. Records: NOAA GHCN-Daily, station USC00116558, 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.