Marathon climate

Marathon Weather in September

NOAA 1991-2020 normals for Whitney Pt Dam, 12.4 km from Marathon

Average highs run from 76°F on September 1 to 68°F on September 30, and lows from 54°F to 45°F. Normal precipitation for the month is 3.96 in.

September day by day

The normal high and low for each date, and the record, in °F.

Normal daily high and low temperature at Marathon, in °F, with the record for each date.20406080100151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

September at a glance

Average high
72°F
Average low
49°F
Precipitation
3.96 in
Record high
91°FSep 7, 2023
Record low
29°FSep 19, 2020
Chance of a freeze
11%
Daylight
13 h 09 min to 11 h 47 min
Cloud cover
60%
Humidity
74%
Dew point
51°F
Wind
4.3 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 176°F54°F88°F 201236°F 20170%
Sep 276°F54°F82°F 201536°F 20170%
Sep 376°F53°F84°F 201439°F 20170%
Sep 476°F53°F88°F 201146°F 20160%
Sep 575°F53°F87°F 202345°F 20200%
Sep 675°F53°F90°F 201838°F 20130%
Sep 775°F52°F91°F 202340°F 20130%
Sep 875°F52°F89°F 201541°F 20250%
Sep 974°F52°F90°F 201538°F 20130%
Sep 1074°F51°F87°F 201540°F 20120%
Sep 1174°F51°F85°F 201336°F 20120%
Sep 1274°F51°F89°F 201341°F 20120%
Sep 1373°F50°F79°F 202340°F 20140%
Sep 1473°F50°F82°F 201643°F 20140%
Sep 1573°F50°F84°F 202435°F 20200%
Sep 1672°F49°F83°F 201836°F 20200%
Sep 1772°F49°F86°F 201830°F 20130%
Sep 1872°F49°F84°F 201733°F 20130%
Sep 1972°F48°F82°F 201529°F 20200%
Sep 2071°F48°F80°F 202430°F 20200%
Sep 2171°F48°F83°F 201632°F 20200%
Sep 2271°F47°F81°F 201932°F 20200%
Sep 2370°F47°F84°F 201935°F 20140%
Sep 2470°F47°F82°F 201733°F 20130%
Sep 2569°F46°F86°F 201732°F 20130%
Sep 2669°F46°F87°F 201736°F 20130%
Sep 2769°F46°F87°F 201740°F 20130%
Sep 2868°F45°F87°F 201740°F 20130%
Sep 2968°F45°F80°F 201938°F 20170%
Sep 3068°F45°F77°F 202538°F 20120%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Marathon, in percent, and of at least 0.1 inch of snowfall.00.21102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (EDT).

September 1
sunrise 6:29 AM, sunset 7:38 PM
September 30
sunrise 7:00 AM, sunset 6:47 PM

Every day of September: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00309442 (Whitney Pt Dam), public domain. Records: NOAA GHCN-Daily, station USC00303050, 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.