Renton climate

Renton Weather in September

NOAA 1991-2020 normals for Renton Muni AP, 1.2 km from Renton

Average highs run from 76°F on September 1 to 67°F on September 30, and lows from 56°F to 50°F. Normal precipitation for the month is 1.53 in over about 9 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 Renton, 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
53°F
Precipitation
1.53 in
Record high
91°FSep 10, 2020
Record low
40°FSep 23, 2000
Chance of a freeze
0%
Daylight
13 h 21 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 176°F56°F90°F 200646°F 202122%0%
Sep 275°F55°F89°F 200647°F 200823%0%
Sep 375°F55°F89°F 200350°F 200823%0%
Sep 475°F55°F87°F 201747°F 200224%0%
Sep 575°F55°F90°F 202446°F 201524%0%
Sep 674°F55°F89°F 202447°F 200225%0%
Sep 774°F55°F89°F 201250°F 200025%0%
Sep 874°F55°F87°F 199947°F 200226%0%
Sep 974°F54°F88°F 202049°F 200126%0%
Sep 1074°F54°F91°F 202049°F 200827%0%
Sep 1173°F54°F89°F 201347°F 201427%0%
Sep 1273°F54°F84°F 199948°F 201228%0%
Sep 1373°F54°F90°F 199946°F 200329%0%
Sep 1472°F54°F88°F 200049°F 201429%0%
Sep 1572°F53°F86°F 201447°F 200330%0%
Sep 1672°F53°F91°F 202546°F 202130%0%
Sep 1771°F53°F81°F 201248°F 201831%0%
Sep 1871°F53°F83°F 200946°F 201832%0%
Sep 1971°F53°F87°F 199948°F 201332%0%
Sep 2070°F52°F82°F 199946°F 200133%0%
Sep 2170°F52°F83°F 199942°F 200233%0%
Sep 2270°F52°F86°F 199944°F 200034%0%
Sep 2369°F52°F84°F 200940°F 200034%0%
Sep 2469°F52°F77°F 200641°F 200035%0%
Sep 2569°F51°F80°F 202142°F 200035%0%
Sep 2668°F51°F83°F 202243°F 201336%0%
Sep 2768°F51°F82°F 200342°F 201536%0%
Sep 2868°F51°F88°F 201744°F 199937%0%
Sep 2967°F51°F78°F 200843°F 201937%0%
Sep 3067°F50°F73°F 202040°F 201938%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Renton, 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 6:28 AM, sunset 7:49 PM
September 30
sunrise 7:07 AM, sunset 6:50 PM

Every day of September: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USW00094248 (Renton Muni AP), 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.