Kennewick climate

Kennewick Weather in September

NOAA 1991-2020 normals for Kennewick, 2.8 km from Kennewick

Average highs run from 86°F on September 1 to 74°F on September 30, and lows from 57°F to 49°F. Normal precipitation for the month is 0.26 in over about 3 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 Kennewick, 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
53°F
Precipitation
0.26 in
Record high
102°FSep 1, 2022
Record low
26°FSep 24, 2000
Chance of a freeze
0%
Days of 90°F or more
3.5
Daylight
13 h 18 min to 11 h 44 min
Cloud cover
40%
Humidity
47%
Dew point
42°F
Wind
7.6 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°F57°F102°F 202238°F 19997%0%
Sep 285°F57°F100°F 199840°F 19997%0%
Sep 385°F57°F98°F 199839°F 19998%0%
Sep 485°F57°F98°F 200339°F 20158%0%
Sep 585°F56°F99°F 200344°F 20058%0%
Sep 684°F56°F98°F 200340°F 20028%0%
Sep 784°F56°F96°F 202439°F 19998%0%
Sep 884°F55°F96°F 202136°F 20018%0%
Sep 983°F55°F94°F 201138°F 20008%0%
Sep 1083°F55°F93°F 201141°F 20078%0%
Sep 1182°F55°F94°F 201337°F 20128%0%
Sep 1282°F54°F97°F 201133°F 20128%0%
Sep 1382°F54°F96°F 201337°F 20129%0%
Sep 1481°F54°F93°F 199836°F 20169%0%
Sep 1581°F53°F94°F 201341°F 20089%0%
Sep 1681°F53°F94°F 199838°F 20069%0%
Sep 1780°F53°F91°F 202337°F 20069%0%
Sep 1880°F53°F91°F 200039°F 201810%0%
Sep 1979°F52°F89°F 201237°F 200410%0%
Sep 2079°F52°F92°F 202537°F 199910%0%
Sep 2179°F52°F89°F 201436°F 200710%0%
Sep 2278°F51°F91°F 199934°F 200210%0%
Sep 2378°F51°F93°F 201128°F 200011%0%
Sep 2477°F51°F93°F 200126°F 200011%0%
Sep 2577°F50°F92°F 202431°F 200011%0%
Sep 2676°F50°F89°F 200332°F 200011%0%
Sep 2776°F50°F87°F 200331°F 199911%0%
Sep 2875°F49°F89°F 201028°F 199912%0%
Sep 2975°F49°F88°F 200633°F 199912%0%
Sep 3074°F49°F85°F 200633°F 202412%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Kennewick, 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 6:17 AM, sunset 7:35 PM
September 30
sunrise 6:54 AM, sunset 6:38 PM

Every day of September: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00454154 (Kennewick), public domain. Records: NOAA GHCN-Daily, station USW00024163, 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.