Friday Harbor climate

Friday Harbor Weather in May

NOAA 1991-2020 normals for Friday Harbor AP, 1.4 km from Friday Harbor

Average highs run from 61°F on May 1 to 66°F on May 31, and lows from 42°F to 47°F. Normal precipitation for the month is 1.14 in over about 10 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 Friday Harbor, 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
44°F
Precipitation
1.14 in
Record high
89°FMay 13, 2023
Record low
30°FMay 7, 2002
Chance of a freeze
3%
Daylight
14 h 35 min to 15 h 50 min
Cloud cover
68%
Humidity
79%
Dew point
47°F
Wind
6.0 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°F42°F79°F 202531°F 201332%0%
May 261°F42°F82°F 201633°F 201232%0%
May 361°F42°F78°F 202636°F 200132%0%
May 461°F42°F74°F 201735°F 201031%0%
May 561°F43°F80°F 201333°F 201031%0%
May 662°F43°F85°F 202531°F 200231%0%
May 762°F43°F75°F 202530°F 200231%0%
May 862°F43°F76°F 202036°F 200131%0%
May 962°F43°F79°F 201932°F 199931%0%
May 1063°F43°F80°F 202431°F 199931%0%
May 1163°F44°F75°F 202434°F 201231%0%
May 1263°F44°F79°F 202334°F 200831%0%
May 1363°F44°F89°F 202335°F 200631%0%
May 1463°F44°F77°F 201432°F 199931%0%
May 1564°F44°F75°F 201434°F 200331%0%
May 1664°F44°F73°F 200835°F 200231%0%
May 1764°F45°F77°F 200837°F 200331%0%
May 1864°F45°F74°F 201536°F 201131%0%
May 1965°F45°F81°F 202335°F 201231%0%
May 2065°F45°F71°F 201736°F 200131%0%
May 2165°F45°F75°F 201736°F 200931%0%
May 2265°F45°F80°F 201737°F 201030%0%
May 2365°F46°F74°F 201738°F 200030%0%
May 2465°F46°F76°F 200837°F 200030%0%
May 2566°F46°F84°F 202335°F 200030%0%
May 2666°F46°F88°F 202336°F 199930%0%
May 2766°F46°F82°F 200541°F 200930%0%
May 2866°F46°F76°F 200537°F 199929%0%
May 2966°F46°F77°F 201936°F 199929%0%
May 3066°F47°F78°F 201940°F 200629%0%
May 3166°F47°F81°F 201938°F 200229%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Friday Harbor, in percent, and of at least 0.1 inch of snowfall.0102030401102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (PDT).

May 1
sunrise 5:52 AM, sunset 8:27 PM
May 31
sunrise 5:15 AM, sunset 9:05 PM

Every day of May: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USW00094276 (Friday Harbor AP), public domain. Records: NOAA GHCN-Daily, station USW00094276, 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.