Downey climate

Downey Weather in September

NOAA 1991-2020 normals for Downey, 0.3 km from Downey

Average highs run from 83°F on September 1 to 70°F on September 30, and lows from 44°F to 37°F. Normal precipitation for the month is 1.44 in.

September day by day

The normal high and low for each date, and the record, in °F.

Normal daily high and low temperature at Downey, in °F, with the record for each date.020406080100120151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

September at a glance

Average high
77°F
Average low
41°F
Precipitation
1.44 in
Record high
102°FSep 3, 2022
Record low
19°FSep 20, 1983
Chance of a freeze
80%
Days of 90°F or more
2.3
Daylight
13 h 08 min to 11 h 46 min
Cloud cover
40%
Humidity
49%
Dew point
35°F
Wind
5.4 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 183°F44°F96°F 201929°F 20060%
Sep 283°F44°F96°F 194731°F 20060%
Sep 382°F44°F102°F 202231°F 19640%
Sep 482°F43°F97°F 202231°F 19650%
Sep 582°F43°F100°F 202032°F 19940%
Sep 681°F43°F101°F 202229°F 19960%
Sep 781°F43°F100°F 202228°F 20100%
Sep 880°F42°F95°F 199429°F 20010%
Sep 980°F42°F95°F 202127°F 20200%
Sep 1080°F42°F94°F 202130°F 20160%
Sep 1179°F42°F95°F 199031°F 19890%
Sep 1279°F42°F94°F 195324°F 20140%
Sep 1378°F42°F94°F 194826°F 19490%
Sep 1478°F41°F97°F 199026°F 19610%
Sep 1577°F41°F96°F 200029°F 19700%
Sep 1677°F41°F94°F 200028°F 19650%
Sep 1776°F41°F94°F 201426°F 19650%
Sep 1876°F41°F92°F 197923°F 19650%
Sep 1975°F40°F90°F 195621°F 19650%
Sep 2075°F40°F89°F 202219°F 19830%
Sep 2175°F40°F88°F 196622°F 19830%
Sep 2274°F40°F92°F 196623°F 19950%
Sep 2374°F39°F90°F 200124°F 19960%
Sep 2473°F39°F91°F 200122°F 20000%
Sep 2572°F39°F93°F 201523°F 19700%
Sep 2672°F39°F90°F 201027°F 19700%
Sep 2771°F38°F89°F 200126°F 19640%
Sep 2871°F38°F92°F 202422°F 19990%
Sep 2970°F38°F89°F 198919°F 19850%
Sep 3070°F37°F90°F 195719°F 19850%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Downey, in percent, and of at least 0.1 inch of snowfall.00.21102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (MDT).

September 1
sunrise 6:54 AM, sunset 8:02 PM
September 30
sunrise 7:25 AM, sunset 7:11 PM

Every day of September: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00102667 (Downey), public domain. Records: NOAA GHCN-Daily, station USW00024156, 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.