Johnson County climate

Johnson County Weather in September

NOAA 1991-2020 normals for Clarksville 6 Ne, 6.6 km from Johnson County

Average highs run from 87°F on September 1 to 78°F on September 30, and lows from 68°F to 57°F. Normal precipitation for the month is 4.17 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 Johnson County, in °F, with the record for each date.20406080100120151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

September at a glance

Average high
83°F
Average low
63°F
Precipitation
4.17 in
Record high
109°FSep 1, 2000
Record low
36°FSep 30, 1999
Chance of a freeze
0%
Days of 90°F or more
5.5
Daylight
12 h 55 min to 11 h 51 min
Cloud cover
45%
Humidity
67%
Dew point
59°F
Wind
4.0 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 187°F68°F109°F 200053°F 200923%0%
Sep 287°F67°F106°F 200054°F 200923%0%
Sep 386°F67°F106°F 200058°F 200923%0%
Sep 486°F67°F107°F 200053°F 201023%0%
Sep 586°F66°F103°F 202651°F 201023%0%
Sep 686°F66°F103°F 202651°F 201123%0%
Sep 785°F66°F101°F 201248°F 201123%0%
Sep 885°F66°F104°F 202650°F 201123%0%
Sep 985°F65°F103°F 202646°F 202423%0%
Sep 1084°F65°F99°F 201348°F 202423%0%
Sep 1184°F65°F100°F 201353°F 200123%0%
Sep 1284°F64°F98°F 202652°F 201523%0%
Sep 1383°F64°F97°F 202650°F 201523%0%
Sep 1483°F64°F99°F 200048°F 199923%0%
Sep 1583°F63°F98°F 202649°F 199922%0%
Sep 1682°F63°F98°F 202647°F 200022%0%
Sep 1782°F62°F98°F 202643°F 200022%0%
Sep 1882°F62°F96°F 200546°F 200022%0%
Sep 1981°F62°F97°F 201048°F 201222%0%
Sep 2081°F61°F99°F 202445°F 200622%0%
Sep 2181°F61°F99°F 202246°F 199922%0%
Sep 2280°F61°F98°F 200544°F 199922%0%
Sep 2380°F60°F95°F 202342°F 199922%0%
Sep 2480°F60°F94°F 202245°F 200222%0%
Sep 2579°F59°F93°F 202341°F 200122%0%
Sep 2679°F59°F93°F 202339°F 200122%0%
Sep 2779°F59°F94°F 202341°F 200122%0%
Sep 2878°F58°F96°F 202343°F 200622%0%
Sep 2978°F58°F95°F 202338°F 200322%0%
Sep 3078°F57°F97°F 202336°F 199922%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Johnson 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 6:46 AM, sunset 7:41 PM
September 30
sunrise 7:08 AM, sunset 6:59 PM

Every day of September: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00031457 (Clarksville 6 Ne), public domain. Records: NOAA GHCN-Daily, station USW00053920, 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.