August weather in Friday Harbor, WA
The average temperature in Friday Harbor in August is 61.6°F (50.0°F–73.3°F). Average precipitation: 0.70 inches.
August is a summer month in Friday Harbor, and is warmer than the annual average of 50.9°F. Daily temperatures swing about 23.3°F between overnight low and afternoon high. Expect about 8 days with precipitation. Daylight averages about 14h 9m. For travel, August is one of the best months of the year to visit.
Avg High
73.3°F
Avg Low
50.0°F
Precipitation
0.70 in
Daylight
14h 9m
August records in Friday Harbor
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| August 1 | 84.0°F (2015) | 44.1°F (2011) | 0.07 in (2005) |
| August 2 | 87.1°F (2017) | 43.0°F (1999) | 0.16 in (2001) |
| August 3 | 88.0°F (2017) | 43.0°F (2008) | 0.11 in (2004) |
| August 4 | 86.0°F (2012) | 43.0°F (2008) | 0.02 in (2001) |
| August 5 | 84.0°F (2012) | 46.0°F (1998) | 0.01 in (2000) |
| August 6 | 84.0°F (2022) | 44.1°F (2013) | 0.49 in (2004) |
| August 7 | 84.0°F (2022) | 46.0°F (2001) | 0.46 in (2010) |
| August 8 | 88.0°F (2018) | 45.0°F (2000) | 0.01 in (1998) |
| August 9 | 88.0°F (2004) | 46.9°F (1998) | 0.21 in (2008) |
| August 10 | 86.0°F (2025) | 46.0°F (1999) | 0.50 in (2009) |
| August 11 | 88.0°F (2025) | 44.1°F (2007) | 0.04 in (2007) |
| August 12 | 93.0°F (2021) | 42.1°F (2000) | 0.16 in (1999) |
| August 13 | 91.9°F (2023) | 43.0°F (2000) | 0.31 in (2014) |
| August 14 | 91.9°F (2023) | 44.1°F (2000) | 0.17 in (2025) |
| August 15 | 91.9°F (2010) | 44.1°F (2000) | 0.64 in (1999) |
| August 16 | 90.0°F (2023) | 42.1°F (2000) | 0.22 in (2005) |
| August 17 | 87.1°F (2022) | 43.0°F (2000) | 0.93 in (2005) |
| August 18 | 87.1°F (2016) | 44.1°F (2006) | 0.36 in (2000) |
| August 19 | 93.0°F (2016) | 45.0°F (2011) | 0.15 in (2007) |
| August 20 | 84.0°F (2016) | 44.1°F (2001) | 0.17 in (2008) |
| August 21 | 86.0°F (2018) | 44.1°F (2002) | 0.55 in (2004) |
| August 22 | 82.0°F (2025) | 43.0°F (2002) | 0.24 in (2011) |
| August 23 | 86.0°F (2025) | 42.1°F (2003) | 0.50 in (2024) |
| August 24 | 87.1°F (2016) | 42.1°F (2003) | 1.37 in (2004) |
| August 25 | 91.0°F (2016) | 45.0°F (2017) | 0.91 in (2004) |
| August 26 | 86.0°F (2016) | 44.1°F (2008) | 0.47 in (2024) |
| August 27 | 82.9°F (2009) | 43.0°F (2000) | 0.04 in (2008) |
| August 28 | 84.9°F (2017) | 42.1°F (2000) | 0.17 in (2008) |
| August 29 | 80.1°F (2007) | 42.1°F (2010) | 1.10 in (2023) |
| August 30 | 86.0°F (2022) | 43.0°F (2003) | 0.08 in (2020) |
| August 31 | 82.9°F (2024) | 42.1°F (2012) | 0.62 in (2010) |