Green Lake County climate

Green Lake County Weather in September

NOAA 1991-2020 normals for Markesan, 11.4 km from Green Lake County

Average highs run from 77°F on September 1 to 67°F on September 30, and lows from 53°F to 43°F. Normal precipitation for the month is 3.27 in over about 11 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 Green Lake County, in °F, with the record for each date.020406080100120151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

September at a glance

Average high
72°F
Average low
48°F
Precipitation
3.27 in
Record high
100°FSep 6, 1922
Record low
16°FSep 22, 1974
Chance of a freeze
43%
Daylight
13 h 12 min to 11 h 46 min
Cloud cover
55%
Humidity
75%
Dew point
53°F
Wind
9.8 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 177°F53°F98°F 195334°F 190935%0%
Sep 277°F53°F98°F 195337°F 194635%0%
Sep 377°F53°F95°F 192933°F 197435%0%
Sep 476°F52°F96°F 202333°F 197436%0%
Sep 576°F52°F94°F 192233°F 196236%0%
Sep 676°F52°F100°F 192233°F 196236%0%
Sep 775°F51°F94°F 191332°F 198636%0%
Sep 875°F51°F99°F 193337°F 194436%0%
Sep 975°F51°F98°F 195536°F 192436%0%
Sep 1075°F50°F98°F 193129°F 191736%0%
Sep 1174°F50°F94°F 193127°F 195536%0%
Sep 1274°F50°F94°F 194825°F 195536%0%
Sep 1374°F49°F94°F 192726°F 192336%0%
Sep 1473°F49°F95°F 193926°F 192336%0%
Sep 1573°F49°F95°F 193930°F 200736%0%
Sep 1673°F48°F94°F 194828°F 193736%0%
Sep 1772°F48°F93°F 195530°F 191637%0%
Sep 1872°F48°F94°F 195525°F 192937%0%
Sep 1971°F47°F90°F 190828°F 193737%0%
Sep 2071°F47°F91°F 190825°F 196237%0%
Sep 2171°F47°F88°F 190829°F 197437%0%
Sep 2270°F46°F94°F 193716°F 197437%0%
Sep 2370°F46°F92°F 193723°F 197437%0%
Sep 2470°F46°F89°F 201726°F 195037%0%
Sep 2569°F45°F89°F 201728°F 194237%0%
Sep 2669°F45°F87°F 201724°F 192637%0%
Sep 2768°F44°F88°F 198823°F 199137%0%
Sep 2868°F44°F86°F 195221°F 194238%0%
Sep 2967°F44°F86°F 192221°F 194938%0%
Sep 3067°F43°F82°F 197124°F 194738%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Green Lake County, in percent, and of at least 0.1 inch of snowfall.0102030401102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (CDT).

September 1
sunrise 6:20 AM, sunset 7:32 PM
September 30
sunrise 6:53 AM, sunset 6:39 PM

Every day of September: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00475096 (Markesan), public domain. Records: NOAA GHCN-Daily, station USC00473405, 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.