Washington climate

Washington Weather in September

NOAA 1991-2020 normals for Washington, 1.1 km from Washington

Average highs run from 85°F on September 1 to 75°F on September 30, and lows from 60°F to 49°F. Normal precipitation for the month is 3.07 in over about 7 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 Washington, in °F, with the record for each date.20406080100120151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

September at a glance

Average high
81°F
Average low
55°F
Precipitation
3.07 in
Record high
109°FSep 3, 2000
Record low
27°FSep 29, 1984
Chance of a freeze
13%
Days of 90°F or more
6.8
Daylight
13 h 03 min to 11 h 48 min
Cloud cover
46%
Humidity
63%
Dew point
53°F
Wind
10.7 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 185°F60°F104°F 197544°F 195524%0%
Sep 285°F60°F102°F 199047°F 195224%0%
Sep 384°F59°F109°F 200037°F 197424%0%
Sep 484°F59°F101°F 200038°F 197424%0%
Sep 584°F59°F102°F 195442°F 196224%0%
Sep 684°F58°F100°F 197840°F 195624%0%
Sep 783°F58°F101°F 197139°F 195624%0%
Sep 883°F58°F101°F 201340°F 195624%0%
Sep 983°F57°F103°F 195543°F 200824%0%
Sep 1083°F57°F100°F 195539°F 197624%0%
Sep 1182°F57°F100°F 200039°F 195924%0%
Sep 1282°F56°F101°F 195640°F 195924%0%
Sep 1382°F56°F102°F 195633°F 201424%0%
Sep 1481°F56°F100°F 195634°F 201424%0%
Sep 1581°F55°F99°F 195532°F 199324%0%
Sep 1681°F55°F98°F 195535°F 199324%0%
Sep 1780°F54°F99°F 195234°F 198024%0%
Sep 1880°F54°F101°F 195335°F 197324%0%
Sep 1980°F54°F99°F 195429°F 199124%0%
Sep 2079°F53°F97°F 202232°F 199124%0%
Sep 2179°F53°F96°F 198030°F 199924%0%
Sep 2278°F52°F102°F 195628°F 199524%0%
Sep 2378°F52°F98°F 201730°F 198324%0%
Sep 2478°F51°F94°F 201732°F 196524%0%
Sep 2577°F51°F94°F 202033°F 197523%0%
Sep 2677°F51°F98°F 202032°F 199123%0%
Sep 2777°F50°F95°F 199030°F 202223%0%
Sep 2876°F50°F96°F 195630°F 195123%0%
Sep 2976°F49°F105°F 195327°F 198423%0%
Sep 3075°F49°F95°F 200227°F 198423%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Washington, in percent, and of at least 0.1 inch of snowfall.05101520251102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (CDT).

September 1
sunrise 6:56 AM, sunset 7:59 PM
September 30
sunrise 7:24 AM, sunset 7:12 PM

Every day of September: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00148578 (Washington), public domain. Records: NOAA GHCN-Daily, station USC00145063, 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.