Sequim climate by month
What the weather is like
Sequim has a warm-summer Mediterranean climate (Köppen Csb): dry, sunny summers and mild, wetter winters.
The warmest month is August, when afternoons average 72° and nights 53°. December is the coolest month, with highs of 45° and lows of 34°. The difference between the warmest and the coolest month is about 23°.
About 29.3 in of precipitation falls in an average year. March is the wettest month (2.5 in, 20 wet days) and August the driest (0.9 in, 5 wet days). Cloud cover ranges from 24% in July to 53% in January.
The sea reaches about 54° in August. Sea temperatures lag the air by a month or two, so late summer is usually warmer for swimming than early summer.
Compared with Washington, the capital, Sequim is 8.6° cooler on a August afternoon and receives less precipitation over the year.
Year in figures
- Hottest afternoons
- 72° · August
- Coldest nights
- 34° · December
- Wettest month
- March
- Driest month
- August
- Clearest skies
- July · 24% cloud
- Warmest sea
- 54° · August
- Longest day
- 16 h 02 min
- Shortest day
- 8 h 23 min
Twelve months at a glance
Temperature and precipitation
Daily high/low range bars, monthly precipitation columns, sea temperature lineTemperature curve
Average high, low and seaDaylight
Hours between sunrise and sunset on the 15th of each monthClimate normals month by month
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Average high | 46° | 48° | 51° | 57° | 63° | 67° | 71° | 72° | 67° | 58° | 50° | 45° |
| Average low | 34° | 34° | 37° | 40° | 46° | 50° | 53° | 53° | 49° | 43° | 37° | 34° |
| Precipitation | 4.1 in | 2.6 in | 2.5 in | 1.9 in | 1.7 in | 1.4 in | 0.8 in | 0.9 in | 1.2 in | 2.8 in | 4.9 in | 4.5 in |
| Wet days (≥1 mm) | 20.1 | 16.6 | 20.2 | 16.1 | 12.3 | 11.3 | 5.2 | 5.1 | 10.8 | 16.4 | 19.8 | 19.9 |
| Cloud cover | 53% | 48% | 48% | 44% | 40% | 36% | 24% | 24% | 25% | 39% | 51% | 52% |
| Sea temperature | 46° | 46° | 47° | 48° | 50° | 52° | 53° | 54° | 53° | 50° | 49° | 47° |
| Daylight | 8h 48 | 10h 15 | 11h 52 | 13h 39 | 15h 11 | 16h 02 | 15h 40 | 14h 20 | 12h 36 | 10h 53 | 9h 16 | 8h 23 |
| Month score | 15 | 18 | 22 | 39 | 63 | 71 | 88 | 88 | 75 | 45 | 16 | 16 |