Monona County climate

Monona County Weather in September

NOAA 1991-2020 normals for Castana Exp Farm, 10.3 km from Monona County

Average highs run from 79°F on September 1 to 71°F on September 30, and lows from 58°F to 47°F. Normal precipitation for the month is 3.05 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 Monona County, in °F, with the record for each date.20406080100120151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

September at a glance

Average high
75°F
Average low
53°F
Precipitation
3.05 in
Record high
106°FSep 2, 2000
Record low
28°FSep 30, 2003
Chance of a freeze
16%
Days of 90°F or more
1.5
Daylight
13 h 07 min to 11 h 47 min
Cloud cover
48%
Humidity
65%
Dew point
52°F
Wind
10.7 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 179°F58°F94°F 201244°F 200927%0%
Sep 279°F57°F106°F 200045°F 202427%0%
Sep 379°F57°F99°F 200042°F 200627%0%
Sep 478°F57°F99°F 201242°F 201027%0%
Sep 578°F57°F95°F 202045°F 201126%0%
Sep 678°F56°F98°F 202042°F 202526%0%
Sep 778°F56°F93°F 200241°F 200826%0%
Sep 878°F56°F94°F 202241°F 201226%0%
Sep 977°F55°F96°F 200039°F 200826%0%
Sep 1077°F55°F97°F 200039°F 199926%0%
Sep 1177°F55°F99°F 201243°F 202226%0%
Sep 1277°F54°F93°F 199840°F 201426%0%
Sep 1376°F54°F97°F 202536°F 201426%0%
Sep 1476°F53°F93°F 201835°F 200726%0%
Sep 1576°F53°F92°F 201833°F 200726%0%
Sep 1676°F53°F92°F 202140°F 199926%0%
Sep 1775°F52°F95°F 200043°F 199925%0%
Sep 1875°F52°F95°F 200034°F 201225%0%
Sep 1975°F51°F95°F 199837°F 200325%0%
Sep 2074°F51°F102°F 202233°F 200625%0%
Sep 2174°F51°F99°F 200531°F 199925%0%
Sep 2274°F50°F95°F 201732°F 201225%0%
Sep 2373°F50°F91°F 201731°F 201225%0%
Sep 2473°F49°F90°F 201731°F 200225%0%
Sep 2573°F49°F94°F 199832°F 200325%0%
Sep 2672°F49°F95°F 199833°F 200125%0%
Sep 2772°F48°F94°F 202134°F 201224%0%
Sep 2871°F48°F94°F 202132°F 200324%0%
Sep 2971°F47°F98°F 202329°F 200324%0%
Sep 3071°F47°F98°F 202328°F 200324%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Monona 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 6:50 AM, sunset 7:57 PM
September 30
sunrise 7:20 AM, sunset 7:07 PM

Every day of September: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00131277 (Castana Exp Farm), public domain. Records: NOAA GHCN-Daily, station USW00094978, 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.