Weather in Friday Harbor

Planning your visit to Friday Harbor? Check out the latest weather information, including detailed forecasts and charts presented below.

The climate of Friday Harbor can be described as mild and temperate, with a noticeable maritime influence. Thanks to its location in the San Juan Islands region, there is no sweltering heat or severe frost here, creating comfortable conditions for travellers who prefer cool and fresh weather. The temperature background remains quite stable throughout the year, changing smoothly from season to season.

Summer in this corner of the United States is usually dry and sunny, but not hot: the average temperature in July and August hovers around +16...+17°C. This is the ideal time for outdoor activities and sea excursions. Winter, on the other hand, is characterised by high humidity and frequent precipitation. Although the thermometer rarely drops below +4°C, there can be up to twenty rainy days a month in December and January.

A characteristic feature of the local weather is the pronounced contrast between the wet winter period and the dry summer. While rain is a rarity in the middle of the year, the number of cloudy days gradually increases with the arrival of autumn. Tourists should take this into account: in summer, you can enjoy clear days with light clothing, while a trip during the shoulder season will definitely require a waterproof windbreaker or an umbrella.

The climate in Friday Harbor is distinguished by its surprising mildness and the absence of extreme temperature fluctuations throughout the year. The warmest period is traditionally the end of summer: in August, average figures reach their peak at around 16–17°C. The coldest month is usually February, when the temperature holds around 5°C; however, severe frosts are rare here even in winter.

Summer in this region can be described as pleasantly warm but not hot, which is perfect for travellers avoiding the heat. Maximum daytime temperatures in July and August average around 18–19°C. Combined with low rainfall during this season, the weather encourages long walks and relaxation in the fresh air without the risk of overheating.

The winter months pass in a mild mode: air temperature remains positive, fluctuating between 4°C and 7°C. A distinctive feature of the local temperature regime is the very small difference between day and night figures — the amplitude of fluctuations often does not exceed 2–3 degrees. This makes the weather in Friday Harbor quite stable and predictable regardless of the time of day.

The nature of precipitation in Friday Harbor has a clearly defined seasonality: one can distinguish a wet winter period and a fairly dry summer. The highest frequency of rain is observed in late autumn and winter. The "wettest" months are considered to be January and December, when up to 20 days with precipitation are recorded. However, it is worth noting that despite the frequent cloudy weather, the total volume of precipitation remains low, indicating a prevalence of light drizzle or short showers rather than prolonged downpours.

In spring, the situation begins to change: the number of rainy days gradually decreases. If precipitation falls for about 13–14 days a month in March and April, this figure drops to 8 days by May. This time of year is excellent for those who prefer freshness but want to avoid the constant dampness characteristic of the winter months.

Summer is undoubtedly the driest and most comfortable season to visit the region. July is the record holder for sunny weather: on average, there are only about 3 days with precipitation here, and the level tends towards zero (0 mm). August also delights tourists with dryness (only 4 rainy days), creating ideal conditions for nature walks and active leisure.

When packing for Friday Harbor, it is worth remembering that the weather here is dictated by the maritime climate, so the main rule of your wardrobe should be layering. Even in the warmest summer months, when the average temperature holds around +16...+19°C, a fresh breeze can blow from the ocean. It is recommended to bring T-shirts, light sweaters or fleece jackets, as well as a windbreaker, so you can easily add or remove layers depending on how you feel. Be sure to take care of comfortable shoes for walking, as the town and its surroundings are conducive to long strolls.

If your trip falls between November and March, be prepared for frequent precipitation: up to 20 rainy days are recorded here during the winter months. At this time of year, a quality waterproof raincoat or a jacket with a hood, as well as waterproof footwear, will become indispensable. The temperature in winter rarely drops below +4°C, but due to humidity and wind, it may feel colder, so a warm scarf and hat will be very useful. An umbrella is a helpful accessory, but functional outerwear often proves more practical in windy weather.

Summer in Friday Harbor is the season with the minimum amount of rain (especially July and August), however, the sun near the water can be quite active. Do not forget to put sunscreen and sunglasses in your suitcase, especially if you plan on sea excursions or kayaking. Despite the fact that it can be sunny and dry during the day, evenings remain cool, so a light jacket or denim jacket will come in handy even at the height of the holiday season.