Last updated Friday at 01:09. The climate profile is taken from closest available data source to San Juan Islands. The islands get about half as much rain as the Seattle area, on average. Travel Advisory: Find the latest information HERE. The combination of a northeasterly swell and moderate to locally fresh winds will create choppy and hazardous seas. Be prepared with a light jacket to take the place of your rain gear as you explore the islands' seasonal beauty. Olympic Peninsula & West Coast Based on weather reports collected during 1985–2015. Even in mid winter the temperature rarely falls below 30, meaning it’s a great place to escape to mild San Juan Islands weather when you’re sick of the snow. You can jump to a separate table for each region of the state: Olympic Peninsula & West Coast, San Juan Islands & Puget Sound, Cascade Mountains and Eastern Washington. Moonrise 2:14 am. Home / Europe / Southern Europe / Canary Islands / San Juan. From this a comfort level is calculated providing categories on how heat conditions might adversely affect someone. The days, however, become very short this far north, with sunset around 4:00pm through December. December is a dry month with an average of 24mm (0.9in) rain. A chance of rain late in the morning, then rain likely early in the afternoon. Weather warnings issued. Average Weather during December in San Juan (North Puerto Rico), Puerto Rico. Hiking is always available year-round, just bring your mud boots and appropriate jacket. December is the snowiest month in San Juan County with 1.8 inches of snow, and 4 months of the year have significant snowfall. Margaret “Sarah” Ruegg was born on Aug. 3, 1941, in Cleveland, Ohio, and passed away on Dec. 17, 2020, in Tucson, Arizona. Even though the ferries are less crowded in winter, it's still a good idea to make a reservation. Dressing in layers is always a good idea as an overcast morning may turn into a beautiful sunny afternoon. The chart below plots the average number of days in any month that you can expect to see snow falling. The average monthly amount of precipitation has been recorded at around 98 mm, that's 4 inches. An annual snowfall of 5.5 inches in San Juan County means that it is about average compared to other places in Washington. A few passing showers possible across the east in the morning and in the west in the afternoon. Winds SE at 5 to 10 mph. 72°. Read on for 10 reasons to visit us during joyous, relaxing December. When the storm tracks shift northward in summer, San Juan Island is left exceptionally dry and sunny. I would choose as a base, San Juan Island, with much to do and to see, plus lots of access to the ocean; others prefer Orcas. Highs in the mid 40s to lower 50s. Leonard G. San Juan. Winter (December through February) Weather is too cold this time of year in San Juan Islands to be enjoyable for warm weather travelers. Summer is rarely above 80º. December is a hot and very rainy time for sunbathing in San Juan.December is an excellent month for swimming in San Juan with very warm sea temperatures. ... San Juan Co Park weather forecast issued on 1 Sep. 1-Day 3-Day 5-Day. Winds SSE at 10 to 20 mph. We have created our own Swimming Water Temperature Index offering a guide to water temperature and comfort levels for swimming; In January, for the nearest coastal location, the temperature of the sea averages around 8°C, that's 46° Fahrenheit. These times of year are fairly slow with tourists. Our index indicates for swimming this is considered very cold and even the most hardy among us would be foolhardy to venture in for a swim and risk hypothermia if exposed for any more than a few minutes. Rainfall amounts a tenth to a quarter of an inch possible. Day by day forecast. The chart below plots the average monthly precipitation amount. The temperature of water an individual will feel comfortable in is very much personal preference. Wed 9 Sep San Juan County. With an average daytime temperature of 46-48 degrees Fahrenheit in December, January and February, winter in the San Juan Islands is mild compared to many other regions of the United States. August is the hottest month for San Juan County with an average high temperature of 71.8°, which ranks it as one of the coolest places in Washington. Averages are for Luis Munoz Marin, which is 8 miles from San Juan. Oakland, California. Throughout the month you can expect to see rain or drizzle falling on 20 days of the month, with snow falling on 4 days. The Rain-shadow; Nestled in the rain-shadow between the Olympic Mountains and Vancouver Island, San Juan Island, unlike most of the Pacific Northwest, enjoys an average of 250 days of sunshine per year. The average daily relative humidity for January is around 79%. In recent years the maximum sustained wind speed has reached 96 km/h, that’s the equivalent of around 60 mph, or 52 knots. Throughout the month of December daytime temperatures will generally reach highs of around 8°C that's about 46°F. Island … Next forecast at approx. The information presented below gives detailed historical monthly average weather conditions along with exceptional weather occurrences. The following charts show yearly weather trends with information on monthly weather averages and extremes. San Juan Weather December Averages, Canary Islands. The average daily wind speed in January has been around 15 km/h, that’s the equivalent to about 9 mph, or 8 knots. The perfect winter retreat, the San Juans are waiting for you this December, January and February! Dec 19, 1939 – Sep 29, 2019. Choose your level of difficulty, from easy walks to challenging climbs, across countless nature preserves and public lands. 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