Brown County climate

Brown County Weather in September

NOAA 1991-2020 normals for Columbia 8 N, 15.3 km from Brown County

Average highs run from 78°F on September 1 to 67°F on September 30, and lows from 53°F to 41°F. Normal precipitation for the month is 2.38 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 Brown County, in °F, with the record for each date.20406080100151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

September at a glance

Average high
73°F
Average low
47°F
Precipitation
2.38 in
Record high
97°FSep 16, 2018
Record low
24°FSep 23, 2012
Chance of a freeze
56%
Days of 90°F or more
0.8
Daylight
13 h 16 min to 11 h 44 min
Cloud cover
53%
Humidity
61%
Dew point
46°F
Wind
11.0 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 178°F53°F93°F 201249°F 202424%0%
Sep 278°F52°F90°F 201247°F 201424%0%
Sep 377°F52°F95°F 202644°F 202524%0%
Sep 477°F52°F94°F 202339°F 202524%0%
Sep 577°F51°F92°F 202640°F 202524%0%
Sep 677°F51°F85°F 202137°F 201724%0%
Sep 776°F51°F88°F 202236°F 202524%0%
Sep 876°F50°F89°F 202238°F 201224%0%
Sep 976°F50°F84°F 202431°F 202024%0%
Sep 1075°F49°F94°F 201231°F 202024%0%
Sep 1175°F49°F94°F 201838°F 202024%0%
Sep 1275°F49°F94°F 201734°F 201424%0%
Sep 1374°F48°F91°F 201733°F 201224%0%
Sep 1474°F48°F89°F 202232°F 201424%0%
Sep 1573°F47°F91°F 201231°F 201124%0%
Sep 1673°F47°F97°F 201834°F 201424%0%
Sep 1773°F46°F85°F 201932°F 201723%
Sep 1872°F46°F85°F 201630°F 201223%
Sep 1972°F46°F88°F 202333°F 201523%
Sep 2071°F45°F84°F 201944°F 202423%
Sep 2171°F45°F91°F 201536°F 201223%
Sep 2271°F44°F91°F 201730°F 201223%
Sep 2370°F44°F82°F 202124°F 201223%
Sep 2470°F43°F82°F 201231°F 201223%
Sep 2569°F43°F85°F 201431°F 202123%
Sep 2669°F42°F87°F 202134°F 201823%
Sep 2768°F42°F86°F 202136°F 201722%
Sep 2868°F42°F91°F 202130°F 201822%
Sep 2967°F41°F88°F 202430°F 201822%
Sep 3067°F41°F86°F 201236°F 201122%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Brown 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 6:55 AM, sunset 8:11 PM
September 30
sunrise 7:31 AM, sunset 7:15 PM

Every day of September: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00391873 (Columbia 8 N), public domain. Records: NOAA GHCN-Daily, station USC00390022, 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.