Jefferson County climate

Jefferson County Weather in September

NOAA 1991-2020 normals for Elwha RS, 26.7 km from Jefferson County

Average highs run from 72°F on September 1 to 63°F on September 30, and lows from 50°F to 45°F. Normal precipitation for the month is 1.63 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 Jefferson County, in °F, with the record for each date.20406080100151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

September at a glance

Average high
68°F
Average low
48°F
Precipitation
1.63 in
Record high
88°FSep 4, 2017
Record low
33°FSep 30, 1999
Chance of a freeze
0%
Daylight
13 h 22 min to 11 h 43 min
Cloud cover
53%
Humidity
81%
Dew point
47°F
Wind
3.8 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 172°F50°F79°F 202440°F 199922%0%
Sep 272°F50°F85°F 200342°F 199922%0%
Sep 372°F50°F83°F 201745°F 199922%0%
Sep 472°F50°F88°F 201742°F 200223%0%
Sep 571°F50°F85°F 202442°F 200223%0%
Sep 671°F50°F87°F 202443°F 200523%0%
Sep 771°F50°F82°F 201142°F 200224%0%
Sep 871°F49°F82°F 201143°F 199924%0%
Sep 970°F49°F82°F 201143°F 201624%0%
Sep 1070°F49°F88°F 202038°F 199925%0%
Sep 1170°F49°F85°F 201342°F 199925%0%
Sep 1270°F49°F75°F 200940°F 201225%0%
Sep 1369°F49°F79°F 199940°F 201726%0%
Sep 1469°F48°F80°F 200041°F 200626%0%
Sep 1569°F48°F78°F 201441°F 201527%0%
Sep 1668°F48°F79°F 201239°F 202127%0%
Sep 1768°F48°F79°F 201242°F 200328%0%
Sep 1868°F48°F78°F 201241°F 201828%0%
Sep 1967°F48°F79°F 199940°F 202529%0%
Sep 2067°F47°F76°F 202240°F 200229%0%
Sep 2167°F47°F79°F 202238°F 200530%0%
Sep 2266°F47°F73°F 200238°F 200030%0%
Sep 2366°F47°F73°F 201135°F 200031%0%
Sep 2465°F46°F75°F 202435°F 200031%0%
Sep 2565°F46°F76°F 202239°F 200032%0%
Sep 2665°F46°F79°F 202238°F 200032%0%
Sep 2764°F46°F76°F 200337°F 199933%0%
Sep 2864°F46°F77°F 200335°F 199934%0%
Sep 2963°F45°F72°F 202039°F 199934%0%
Sep 3063°F45°F72°F 202033°F 199935%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Jefferson 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 (PDT).

September 1
sunrise 6:33 AM, sunset 7:55 PM
September 30
sunrise 7:12 AM, sunset 6:55 PM

Every day of September: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00452548 (Elwha RS), public domain. Records: NOAA GHCN-Daily, station USW00094266, 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.