Walker Mill climate

Walker Mill Weather in September

NOAA 1991-2020 normals for Natl Arboretum Dc, 8.3 km from Walker Mill

Average highs run from 86°F on September 1 to 76°F on September 30, and lows from 66°F to 56°F. Normal precipitation for the month is 4.12 in over about 10 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 Walker Mill, in °F, with the record for each date.20406080100151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

September at a glance

Average high
82°F
Average low
62°F
Precipitation
4.12 in
Record high
99°FSep 12, 1983
Record low
30°FSep 24, 1974
Chance of a freeze
0%
Days of 90°F or more
4.3
Daylight
13 h 01 min to 11 h 49 min
Cloud cover
55%
Humidity
71%
Dew point
58°F
Wind
8.1 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 186°F66°F96°F 199146°F 198631%0%
Sep 286°F66°F97°F 198045°F 196731%0%
Sep 386°F66°F98°F 198042°F 196731%0%
Sep 486°F66°F96°F 199348°F 196731%0%
Sep 585°F65°F95°F 196440°F 196731%0%
Sep 685°F65°F96°F 198546°F 198231%0%
Sep 785°F65°F97°F 198342°F 198431%0%
Sep 885°F64°F96°F 198542°F 196231%0%
Sep 984°F64°F94°F 200738°F 198631%0%
Sep 1084°F64°F96°F 201536°F 195631%0%
Sep 1184°F63°F97°F 198343°F 197231%0%
Sep 1283°F63°F99°F 198336°F 196731%0%
Sep 1383°F63°F95°F 198339°F 195831%0%
Sep 1483°F62°F91°F 196238°F 197531%0%
Sep 1582°F62°F93°F 199539°F 197531%0%
Sep 1682°F62°F92°F 199339°F 198531%0%
Sep 1781°F61°F95°F 197036°F 198631%0%
Sep 1881°F61°F95°F 199134°F 199031%0%
Sep 1981°F60°F95°F 199134°F 195931%0%
Sep 2080°F60°F92°F 196535°F 195931%0%
Sep 2180°F60°F90°F 198332°F 195631%0%
Sep 2279°F59°F93°F 199833°F 196231%0%
Sep 2379°F59°F95°F 197034°F 198331%0%
Sep 2479°F58°F95°F 197030°F 197431%0%
Sep 2578°F58°F96°F 201033°F 196331%0%
Sep 2678°F58°F93°F 197036°F 196331%0%
Sep 2777°F57°F92°F 197038°F 198431%0%
Sep 2877°F57°F95°F 199834°F 195731%0%
Sep 2977°F56°F85°F 195937°F 198131%0%
Sep 3076°F56°F87°F 197336°F 196131%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Walker Mill, 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 (EDT).

September 1
sunrise 6:37 AM, sunset 7:38 PM
September 30
sunrise 7:03 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 USC00186350 (Natl Arboretum Dc), public domain. Records: NOAA GHCN-Daily, station USC00189070, 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.