Chester climate

Chester Weather in September

NOAA 1991-2020 normals for Chester, 0.9 km from Chester

Average highs run from 83°F on September 1 to 74°F on September 30, and lows from 44°F to 37°F. Normal precipitation for the month is 0.31 in over about 2 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 Chester, in °F, with the record for each date.020406080100120151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

September at a glance

Average high
79°F
Average low
41°F
Precipitation
0.31 in
Record high
106°FSep 4, 2024
Record low
15°FSep 19, 1965
Chance of a freeze
57%
Days of 90°F or more
1.3
Daylight
13 h 03 min to 11 h 47 min
Cloud cover
26%
Humidity
38%
Dew point
29°F
Wind
4.9 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°F97°F 202431°F 19605%0%
Sep 283°F43°F97°F 198828°F 19645%0%
Sep 382°F43°F98°F 198829°F 19645%0%
Sep 482°F43°F106°F 202425°F 19785%0%
Sep 582°F43°F104°F 202427°F 19655%0%
Sep 682°F43°F104°F 202432°F 19606%0%
Sep 782°F42°F100°F 202229°F 19616%0%
Sep 881°F42°F97°F 202229°F 19646%0%
Sep 981°F42°F97°F 202428°F 19646%0%
Sep 1081°F42°F99°F 202428°F 19646%0%
Sep 1181°F42°F95°F 202427°F 19857%0%
Sep 1280°F41°F93°F 197130°F 19657%0%
Sep 1380°F41°F95°F 197131°F 19607%0%
Sep 1480°F41°F93°F 197122°F 19707%0%
Sep 1580°F41°F92°F 198127°F 19707%0%
Sep 1679°F41°F91°F 200826°F 19598%0%
Sep 1779°F40°F89°F 196221°F 19658%0%
Sep 1879°F40°F91°F 197425°F 19788%0%
Sep 1978°F40°F90°F 197415°F 19658%0%
Sep 2078°F40°F91°F 196020°F 19789%0%
Sep 2178°F40°F90°F 197425°F 19689%0%
Sep 2277°F39°F95°F 202426°F 19619%0%
Sep 2377°F39°F98°F 202424°F 19729%0%
Sep 2476°F39°F94°F 202421°F 195810%0%
Sep 2576°F39°F92°F 200325°F 196110%0%
Sep 2676°F38°F93°F 200929°F 196110%0%
Sep 2775°F38°F94°F 200927°F 197011%0%
Sep 2875°F38°F91°F 200923°F 195911%0%
Sep 2974°F38°F88°F 200825°F 196111%0%
Sep 3074°F37°F93°F 202423°F 196111%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Chester, in percent, and of at least 0.1 inch of snowfall.02.557.51012.51102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (PDT).

September 1
sunrise 6:33 AM, sunset 7:36 PM
September 30
sunrise 7:01 AM, sunset 6:48 PM

Every day of September: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00041700 (Chester), public domain. Records: NOAA GHCN-Daily, station USC00041700, 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.