Lake Marcel-Stillwater climate

Lake Marcel-Stillwater Weather in September

NOAA 1991-2020 normals for Tolt S Fk Rsvr, 16.8 km from Lake Marcel-Stillwater

Average highs run from 70°F on September 1 to 61°F on September 30, and lows from 53°F to 47°F. Normal precipitation for the month is 5.58 in over about 13 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 Lake Marcel-Stillwater, in °F, with the record for each date.20406080100151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

September at a glance

Average high
66°F
Average low
50°F
Precipitation
5.58 in
Record high
91°FSep 10, 2020
Record low
40°FSep 23, 2000
Chance of a freeze
0%
Daylight
13 h 22 min to 11 h 43 min
Cloud cover
48%
Humidity
76%
Dew point
49°F
Wind
3.4 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 170°F53°F90°F 200646°F 202136%0%
Sep 270°F52°F89°F 200647°F 200836%0%
Sep 369°F52°F89°F 200350°F 200836%0%
Sep 469°F52°F87°F 201747°F 200237%0%
Sep 569°F52°F90°F 202446°F 201537%0%
Sep 669°F52°F89°F 202447°F 200238%0%
Sep 769°F52°F89°F 201250°F 200038%0%
Sep 868°F52°F87°F 199947°F 200239%0%
Sep 968°F52°F88°F 202049°F 200139%0%
Sep 1068°F51°F91°F 202049°F 200840%0%
Sep 1168°F51°F89°F 201347°F 201440%0%
Sep 1267°F51°F84°F 199948°F 201241%0%
Sep 1367°F51°F90°F 199946°F 200341%0%
Sep 1467°F51°F88°F 200049°F 201442%0%
Sep 1566°F51°F86°F 201447°F 200342%0%
Sep 1666°F51°F91°F 202546°F 202143%0%
Sep 1766°F50°F81°F 201248°F 201843%0%
Sep 1865°F50°F83°F 200946°F 201844%0%
Sep 1965°F50°F87°F 199948°F 201344%0%
Sep 2065°F50°F82°F 199946°F 200145%0%
Sep 2164°F50°F83°F 199942°F 200245%0%
Sep 2264°F49°F86°F 199944°F 200045%0%
Sep 2364°F49°F84°F 200940°F 200046%0%
Sep 2463°F49°F77°F 200641°F 200046%0%
Sep 2563°F49°F80°F 202142°F 200047%0%
Sep 2663°F48°F83°F 202243°F 201347%0%
Sep 2762°F48°F82°F 200342°F 201548%0%
Sep 2862°F48°F88°F 201744°F 199948%0%
Sep 2961°F48°F78°F 200843°F 201948%0%
Sep 3061°F47°F73°F 202040°F 201949%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Lake Marcel-Stillwater, in percent, and of at least 0.1 inch of snowfall.010203040501102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (PDT).

September 1
sunrise 6:26 AM, sunset 7:48 PM
September 30
sunrise 7:06 AM, sunset 6:49 PM

Every day of September: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00458508 (Tolt S Fk Rsvr), public domain. Records: NOAA GHCN-Daily, station USW00094248, 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.