May weather in Friday Harbor, WA
The average temperature in Friday Harbor in May is 54.0°F (44.3°F–63.7°F). Average precipitation: 1.14 inches.
May is a spring month in Friday Harbor, and is warmer than the annual average of 50.9°F. Daily temperatures swing about 19.4°F between overnight low and afternoon high. Expect about 10 days with precipitation. Daylight averages about 15h 1m. For travel, May is a comfortable month to visit.
Avg High
63.7°F
Avg Low
44.3°F
Precipitation
1.14 in
Daylight
15h 1m
May records in Friday Harbor
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| May 1 | 79.0°F (2025) | 31.1°F (2013) | 0.09 in (1999) |
| May 2 | 82.0°F (2016) | 33.1°F (2012) | 0.35 in (2010) |
| May 3 | 70.0°F (2016) | 36.0°F (2001) | 0.19 in (2008) |
| May 4 | 73.9°F (2017) | 35.1°F (2010) | 0.30 in (2001) |
| May 5 | 80.1°F (2013) | 33.1°F (2010) | 0.34 in (2022) |
| May 6 | 84.9°F (2025) | 30.9°F (2002) | 0.34 in (2009) |
| May 7 | 75.0°F (2025) | 30.0°F (2002) | 0.08 in (2006) |
| May 8 | 75.9°F (2020) | 36.0°F (2001) | 0.27 in (2005) |
| May 9 | 79.0°F (2019) | 2.1°F (2007) | 0.16 in (2005) |
| May 10 | 80.1°F (2024) | 1.2°F (2007) | 0.44 in (2000) |
| May 11 | 75.0°F (2024) | 34.0°F (2012) | 0.24 in (2017) |
| May 12 | 79.0°F (2023) | 34.0°F (2008) | 0.18 in (2017) |
| May 13 | 89.1°F (2023) | 35.1°F (2006) | 0.62 in (2008) |
| May 14 | 77.0°F (2014) | 32.0°F (1999) | 0.50 in (2011) |
| May 15 | 98.1°F (2023) | 34.0°F (2003) | 0.55 in (2011) |
| May 16 | 73.0°F (2008) | 35.1°F (2002) | 0.29 in (2002) |
| May 17 | 77.0°F (2008) | 37.0°F (2003) | 0.41 in (1999) |
| May 18 | 73.9°F (2015) | 36.0°F (2011) | 0.36 in (2009) |
| May 19 | 81.0°F (2023) | 35.1°F (2012) | 0.16 in (2025) |
| May 20 | 71.1°F (2017) | 36.0°F (2001) | 0.17 in (2000) |
| May 21 | 75.0°F (2017) | 36.0°F (2009) | 1.07 in (2024) |
| May 22 | 80.1°F (2017) | 37.0°F (2010) | 0.53 in (2004) |
| May 23 | 73.9°F (2017) | 37.9°F (2000) | 0.07 in (2014) |
| May 24 | 75.9°F (2008) | 37.0°F (2000) | 0.21 in (1998) |
| May 25 | 84.0°F (2023) | 35.1°F (2000) | 0.65 in (2011) |
| May 26 | 88.0°F (2023) | 36.0°F (1999) | 0.31 in (1998) |
| May 27 | 82.0°F (2005) | 41.0°F (2009) | 0.67 in (1998) |
| May 28 | 75.9°F (2005) | 37.0°F (1999) | 0.41 in (2010) |
| May 29 | 77.0°F (2019) | 36.0°F (1999) | 0.26 in (2024) |
| May 30 | 78.1°F (2019) | 39.9°F (2006) | 0.30 in (2000) |
| May 31 | 81.0°F (2019) | 37.9°F (2002) | 0.19 in (2005) |