Yelm climate

Yelm Weather in September

NOAA 1991-2020 normals for Olympia AP, 22.8 km from Yelm

Average highs run from 76°F on September 1 to 67°F on September 30, and lows from 49°F to 44°F. Normal precipitation for the month is 2.04 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 Yelm, 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
46°F
Precipitation
2.04 in
Record high
90°FSep 16, 2025
Record low
40°FSep 30, 2019
Chance of a freeze
14%
Daylight
13 h 20 min to 11 h 44 min
Cloud cover
51%
Humidity
75%
Dew point
49°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 176°F49°F85°F 202445°F 202122%0%
Sep 276°F49°F88°F 200646°F 199922%0%
Sep 376°F48°F86°F 200349°F 199922%0%
Sep 475°F48°F88°F 200345°F 200023%0%
Sep 575°F48°F89°F 202448°F 200223%0%
Sep 675°F48°F87°F 202449°F 200224%0%
Sep 775°F48°F86°F 201249°F 199924%0%
Sep 875°F48°F82°F 199949°F 200124%0%
Sep 974°F47°F84°F 202049°F 201625%0%
Sep 1074°F47°F88°F 202048°F 199925%0%
Sep 1174°F47°F88°F 201347°F 200026%0%
Sep 1274°F47°F84°F 200949°F 200026%0%
Sep 1373°F47°F84°F 199947°F 202027%0%
Sep 1473°F47°F83°F 201448°F 201627%0%
Sep 1573°F46°F85°F 201445°F 201728%0%
Sep 1672°F46°F90°F 202543°F 202128%0%
Sep 1772°F46°F78°F 202546°F 200329%0%
Sep 1872°F46°F80°F 201244°F 201829%0%
Sep 1971°F46°F81°F 199946°F 201830%0%
Sep 2071°F46°F77°F 199947°F 200230%0%
Sep 2171°F45°F78°F 202246°F 202331%0%
Sep 2270°F45°F84°F 200945°F 200531%0%
Sep 2370°F45°F81°F 200941°F 200032%0%
Sep 2470°F45°F78°F 202441°F 200033%0%
Sep 2569°F45°F77°F 200642°F 200033%0%
Sep 2669°F44°F83°F 202242°F 200034%0%
Sep 2768°F44°F78°F 200342°F 200034%0%
Sep 2868°F44°F83°F 201744°F 199935%0%
Sep 2967°F44°F75°F 200844°F 201636%0%
Sep 3067°F44°F72°F 202040°F 201936%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Yelm, 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 6:30 AM, sunset 7:50 PM
September 30
sunrise 7:08 AM, sunset 6:52 PM

Every day of September: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USW00024227 (Olympia AP), public domain. Records: NOAA GHCN-Daily, station USW00094274, 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.