Umatilla climate

Umatilla Weather in August

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

Average highs run from 90°F on August 1 to 84°F on August 31, and lows from 63°F to 58°F. Normal precipitation for the month is 0.25 in over about 2 wet days.

August 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

August at a glance

Average high
88°F
Average low
61°F
Precipitation
0.25 in
Record high
110°FAug 4, 1998
Record low
38°FAug 25, 2012
Chance of a freeze
0%
Days of 90°F or more
13.2
Daylight
14 h 46 min to 13 h 20 min
Cloud cover
31%
Humidity
42%
Dew point
47°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
Aug 190°F63°F109°F 200941°F 20025%0%
Aug 290°F63°F106°F 202447°F 20265%0%
Aug 390°F63°F106°F 202143°F 20025%0%
Aug 490°F63°F110°F 199845°F 20266%0%
Aug 590°F63°F101°F 200543°F 20026%0%
Aug 690°F62°F103°F 201249°F 20226%0%
Aug 790°F62°F102°F 201850°F 20156%0%
Aug 889°F62°F105°F 201845°F 20046%0%
Aug 989°F62°F105°F 201848°F 20046%0%
Aug 1089°F62°F104°F 201749°F 20076%0%
Aug 1189°F62°F104°F 202145°F 20077%0%
Aug 1289°F62°F104°F 202149°F 20007%0%
Aug 1389°F62°F103°F 200146°F 20067%0%
Aug 1488°F62°F104°F 202345°F 20057%0%
Aug 1588°F61°F107°F 202347°F 20057%0%
Aug 1688°F61°F107°F 202347°F 20117%0%
Aug 1788°F61°F107°F 200844°F 19987%0%
Aug 1888°F61°F105°F 202244°F 19988%0%
Aug 1987°F61°F101°F 200945°F 20028%0%
Aug 2087°F60°F105°F 200943°F 20008%0%
Aug 2187°F60°F100°F 200542°F 20008%0%
Aug 2287°F60°F99°F 202244°F 20008%0%
Aug 2386°F60°F97°F 200043°F 20108%0%
Aug 2486°F60°F99°F 202540°F 20108%0%
Aug 2586°F59°F98°F 202238°F 20128%0%
Aug 2686°F59°F97°F 201145°F 20128%0%
Aug 2785°F59°F98°F 199942°F 20009%0%
Aug 2885°F58°F104°F 202340°F 20009%0%
Aug 2985°F58°F100°F 201742°F 20249%0%
Aug 3084°F58°F102°F 200742°F 20129%0%
Aug 3184°F58°F102°F 202241°F 20069%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.02468101102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (PDT).

August 1
sunrise 5:40 AM, sunset 8:26 PM
August 31
sunrise 6:17 AM, sunset 7:37 PM

Every day of August: 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.