Umatilla climate

Umatilla Weather in September

NOAA 1991-2020 normals for Mcnary Dam #2, 3.9 km from Umatilla

Average highs run from 84°F on September 1 to 72°F on September 30, and lows from 57°F to 49°F. Normal precipitation for the month is 0.40 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 Umatilla, in °F, with the record for each date.20406080100120151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

September at a glance

Average high
78°F
Average low
53°F
Precipitation
0.40 in
Record high
100°FSep 1, 2022
Record low
26°FSep 23, 2000
Chance of a freeze
0%
Days of 90°F or more
1.8
Daylight
13 h 17 min to 11 h 44 min
Cloud cover
40%
Humidity
47%
Dew point
43°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 184°F57°F100°F 202235°F 20069%0%
Sep 283°F57°F99°F 202537°F 19999%0%
Sep 383°F57°F99°F 202537°F 19999%0%
Sep 483°F57°F98°F 200339°F 20029%0%
Sep 582°F56°F97°F 199839°F 20149%0%
Sep 682°F56°F99°F 200340°F 20029%0%
Sep 782°F56°F95°F 201138°F 199910%0%
Sep 881°F56°F95°F 202136°F 199910%0%
Sep 981°F55°F96°F 201137°F 202010%0%
Sep 1081°F55°F94°F 201340°F 200710%0%
Sep 1180°F55°F95°F 201333°F 201210%0%
Sep 1280°F54°F95°F 201131°F 201410%0%
Sep 1379°F54°F94°F 200933°F 201211%0%
Sep 1479°F54°F95°F 201336°F 201611%0%
Sep 1578°F54°F97°F 201339°F 200811%0%
Sep 1678°F53°F93°F 199837°F 202112%0%
Sep 1778°F53°F91°F 202337°F 200612%0%
Sep 1877°F53°F91°F 200839°F 200513%0%
Sep 1977°F53°F91°F 201236°F 200413%0%
Sep 2076°F52°F91°F 202534°F 200713%0%
Sep 2176°F52°F90°F 201433°F 200914%0%
Sep 2275°F52°F91°F 199932°F 200214%0%
Sep 2375°F51°F91°F 201126°F 200015%0%
Sep 2474°F51°F91°F 200126°F 200015%0%
Sep 2574°F51°F91°F 202131°F 200015%0%
Sep 2673°F51°F89°F 200332°F 200016%0%
Sep 2773°F50°F88°F 202228°F 199916%0%
Sep 2873°F50°F88°F 201030°F 199917%0%
Sep 2972°F50°F87°F 200633°F 199917%0%
Sep 3072°F49°F85°F 200633°F 201918%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Umatilla, in percent, and of at least 0.1 inch of snowfall.051015201102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (PDT).

September 1
sunrise 6:18 AM, sunset 7:35 PM
September 30
sunrise 6:55 AM, sunset 6:39 PM

Every day of September: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00355392 (Mcnary Dam #2), public domain. Records: NOAA GHCN-Daily, station USW00004113, 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.