The climate is predominantly a marine type with cool summers, mild but rather cloudy winters, moist air, and a small daily range in temperatures. The weather is extremely unpredictable.
Rainfall is quite varied.
Sequim, on the northeast side of the peninsula receives an average of about seventeen inches of precipitation a year. While forty airline miles to the west, in the rain forest valleys, precipitation can average as much as 140 inches per year. Seventy-six percent of the yearly precipitation falls during the six months between October 1 and March 31. There is no definite time for the beginning and ending of the dry or rainy seasons. The transition is gradual and variable.