Whatcom County climate

Whatcom County Weather in May

NOAA 1991-2020 normals for Upper Baker Dam, 23.7 km from Whatcom County

Average highs run from 61°F on May 1 to 66°F on May 31, and lows from 38°F to 45°F. Normal precipitation for the month is 4.52 in over about 14 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 Whatcom County, in °F, with the record for each date.20406080100151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

May at a glance

Average high
64°F
Average low
42°F
Precipitation
4.52 in
Record high
90°FMay 28, 1983
Record low
25°FMay 1, 1954
Chance of a freeze
28%
Daylight
14 h 36 min to 15 h 53 min
Cloud cover
70%
Humidity
80%
Dew point
43°F
Wind
3.1 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
May 161°F38°F78°F 201425°F 195451%0%
May 261°F39°F86°F 201633°F 200651%0%
May 361°F39°F76°F 202632°F 195651%0%
May 462°F39°F80°F 195330°F 194950%0%
May 562°F39°F86°F 195331°F 195250%0%
May 662°F40°F79°F 201331°F 196549%0%
May 762°F40°F75°F 196930°F 196249%0%
May 863°F40°F79°F 202036°F 196348%0%
May 963°F40°F82°F 202034°F 200248%0%
May 1063°F41°F81°F 201931°F 199948%0%
May 1163°F41°F82°F 197133°F 201247%0%
May 1263°F41°F79°F 202335°F 199247%0%
May 1364°F41°F87°F 195935°F 200047%0%
May 1464°F42°F85°F 197333°F 196447%0%
May 1564°F42°F86°F 202332°F 196447%0%
May 1664°F42°F78°F 195236°F 200247%0%
May 1764°F42°F82°F 200834°F 196647%0%
May 1864°F43°F86°F 195833°F 196647%0%
May 1965°F43°F81°F 196136°F 200347%0%
May 2065°F43°F83°F 196334°F 197547%0%
May 2165°F43°F87°F 196335°F 197147%0%
May 2265°F43°F80°F 195839°F 198447%0%
May 2365°F44°F88°F 196933°F 195547%0%
May 2465°F44°F83°F 199236°F 195047%0%
May 2565°F44°F80°F 197935°F 197247%0%
May 2665°F44°F84°F 200538°F 195147%0%
May 2765°F44°F83°F 200535°F 197347%0%
May 2865°F45°F90°F 198335°F 196647%0%
May 2965°F45°F82°F 198336°F 194947%0%
May 3066°F45°F85°F 195637°F 195347%0%
May 3166°F45°F81°F 196434°F 195347%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Whatcom County, in percent, and of at least 0.1 inch of snowfall.02040601102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (PDT).

May 1
sunrise 5:47 AM, sunset 8:23 PM
May 31
sunrise 5:09 AM, sunset 9:02 PM

Every day of May: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00458715 (Upper Baker Dam), public domain. Records: NOAA GHCN-Daily, station USW00024217, 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.