Umatilla climate

Umatilla Weather in May

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

Average highs run from 68°F on May 1 to 75°F on May 31, and lows from 45°F to 51°F. Normal precipitation for the month is 0.75 in over about 7 wet days.

May 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

May at a glance

Average high
72°F
Average low
48°F
Precipitation
0.75 in
Record high
100°FMay 18, 2006
Record low
24°FMay 1, 2013
Chance of a freeze
2%
Daylight
14 h 21 min to 15 h 29 min
Cloud cover
58%
Humidity
53%
Dew point
42°F
Wind
8.7 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
May 168°F45°F86°F 199824°F 201323%0%
May 268°F45°F88°F 201625°F 200623%0%
May 369°F45°F92°F 201625°F 200623%0%
May 469°F46°F89°F 201729°F 201123%0%
May 569°F46°F85°F 202633°F 200623%0%
May 670°F46°F89°F 201327°F 200023%0%
May 770°F46°F89°F 201330°F 200323%0%
May 870°F46°F91°F 200728°F 200223%0%
May 970°F47°F92°F 201329°F 200623%0%
May 1071°F47°F96°F 201325°F 199923%0%
May 1171°F47°F94°F 201329°F 199924%0%
May 1271°F47°F89°F 200131°F 201224%0%
May 1372°F48°F92°F 202329°F 200624%0%
May 1472°F48°F92°F 202334°F 199924%0%
May 1572°F48°F94°F 201834°F 200924%0%
May 1672°F48°F97°F 200632°F 200224%0%
May 1772°F48°F99°F 200635°F 200124%0%
May 1873°F49°F100°F 200637°F 200324%0%
May 1973°F49°F96°F 202330°F 200324%0%
May 2073°F49°F97°F 202335°F 200324%0%
May 2173°F49°F90°F 200035°F 200124%0%
May 2273°F49°F95°F 200136°F 200924%0%
May 2374°F50°F99°F 200134°F 201324%0%
May 2474°F50°F95°F 200135°F 200224%0%
May 2574°F50°F90°F 200139°F 201024%0%
May 2674°F50°F94°F 200134°F 199924%0%
May 2774°F51°F94°F 200537°F 199924%0%
May 2875°F51°F97°F 200538°F 199824%0%
May 2975°F51°F97°F 201737°F 200124%0%
May 3075°F51°F96°F 200937°F 201424%0%
May 3175°F51°F93°F 200139°F 201623%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.05101520251102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (PDT).

May 1
sunrise 5:44 AM, sunset 8:05 PM
May 31
sunrise 5:11 AM, sunset 8:40 PM

Every day of May: 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.