San Juan Islands, Washington, United States of America: What to pack, what to wear, and when to go [2018]

Traveling to San Juan Islands, Washington, United States of America? If you're planning to go to San Juan Islands, here is some important information about when to go, what to wear, and what to pack:

When to go to San Juan Islands, Washington, United States of America

Based on the climate and weather in San Juan Islands, the best time to go is August. See below for details.

What to wear/what to pack for San Juan Islands, Washington, United States of America by month

January

If you are traveling to San Juan Islands in January, you will notice that it is pretty cool and very rainy. Expect it to rain about half of the time and snow once in a while.

Daytime temperatures are in the 40s F (single digits C).

What to wear/what to pack:

  • If you plan to ski, ski equipment
  • Light gloves or mittens
  • Waterproof coat
  • Fleeces
  • Jacket or coat
  • Warm pants or jeans
  • Waterproof boots
  • Umbrella
  • Standard footwear
  • Socks

February

If you vacation in San Juan Islands during February, you are likely to find that it can be brisk and somewhat rainy. Temperatures tend to hover around the high 40s F (single digits C) during the day, while at night they can dip into the 30s F (single digits C).

Humidity is generally around 70.1 during the day. In terms of precipitation, you can expect it to rain about half of the time.

What to wear/what to pack:

  • Umbrella
  • Warm pants or jeans
  • Standard footwear
  • Fleeces
  • Light gloves or mittens
  • Waterproof boots
  • Socks
  • Waterproof coat
  • Jacket or coat
  • If you plan to ski, ski equipment

March

If you go to San Juan Islands in March, you will notice that it is cold and somewhat rainy. Expect it to rain about half of the time. Daytime temperatures are in the low 50s F (low 10s C).

What to wear/what to pack:

  • Jacket or coat
  • Socks
  • Light gloves or mittens
  • Waterproof footwear
  • Fleeces
  • Warm pants or jeans
  • Umbrella
  • Standard footwear
  • Rain coat
  • Waterproof luggage

April

If you vacation in San Juan Islands during April, you are likely to find that it can be chilly and somewhat rainy. Temperatures tend to hover around the 50s F (mid 10s C) during the day, while at night they can dip into the low 30s F (single digits C).

Humidity is generally around 60.3 during the day. In terms of precipitation, you can expect it to rain about half of the time.

What to wear/what to pack:

  • Fleeces
  • Umbrella
  • Warm pants or jeans
  • Rain coat
  • Waterproof luggage
  • Standard footwear
  • Light gloves or mittens
  • Jacket or coat
  • Waterproof footwear
  • Socks

May

May in San Juan Islands is cool and somewhat rainy. The average overnight temperatures in the area are in the 40s F (single digits C).

It tends to rain 5-10 days this month. But the colder weather doesn't bring low humidity, which is in the 50% to 60% range on average.

What to wear/what to pack:

  • Rain coat
  • Light jacket or fleece
  • Dresses
  • Waterproof luggage
  • Long skirts
  • Standard footwear
  • Long sleeve shirts or blouses
  • Umbrella
  • Pants or jeans
  • Socks
  • Waterproof footwear

June

In June, San Juan Islands is mild and somewhat rainy. Temperatures routinely are in the high 60s F (low 10s C) and a bit less than half of the time jump into the low 70s F (low 20s C) range. At night, lows are in the low 40s F (single digits C).

This is also a rainy time for San Juan Islands, with several of the days of the month having rain. In June, humidity reaches as high as 60%.

What to wear/what to pack:

  • Dresses
  • Long sleeve shirts or blouses
  • Pants or jeans
  • Long skirts
  • Rain coat
  • Socks
  • Standard footwear
  • Light jacket or fleece
  • Umbrella
  • Waterproof luggage
  • Waterproof footwear

July

July for San Juan Islands is balmy. Temperatures average in the low 70s F (low 20s C) during the day. It rains once in a while.

What to wear/what to pack:

  • Light footwear
  • Long and short sleeve shirts
  • Skirts
  • Dresses
  • Shorts or short pants
  • Waterproof luggage
  • Waterproof footwear
  • Sandals
  • Sunscreen lotion
  • Rain coat
  • Umbrella

August

If you visit San Juan Islands during August, you are likely to find that it is balmy. Temperatures tend to hover around the low 70s F (low 20s C) during the day, while at night they can dip into the low 50s F (low 10s C).

Humidity is generally between 50 and 60% during the day. In terms of precipitation, you can expect it to rain occasionally.

What to wear/what to pack:

  • Waterproof luggage
  • Waterproof footwear
  • Skirts
  • Sunscreen lotion
  • Long and short sleeve shirts
  • Dresses
  • Shorts or short pants
  • Light footwear
  • Sandals
  • Rain coat
  • Umbrella

September

September in San Juan Islands is balmy. The average overnight temperatures in the area are in the high 40s F (single digits C).

It tends to rain regularly. But the colder weather doesn't bring low humidity, which is in the 60% to 60% range on average.

What to wear/what to pack:

  • Rain coat
  • Standard footwear
  • Dresses
  • Long skirts
  • Light jacket or fleece
  • Socks
  • Umbrella
  • Waterproof luggage
  • Long sleeve shirts or blouses
  • Pants or jeans
  • Waterproof footwear

October

October here is chilly and somewhat rainy. Temperatures average in the high 50s F (mid 10s C) during the day. It rains about half of the time.

What to wear/what to pack:

  • Long sleeve shirts or blouses
  • Long skirts
  • Umbrella
  • Socks
  • Pants or jeans
  • Rain coat
  • Standard footwear
  • Waterproof luggage
  • Waterproof footwear
  • Light jacket or fleece
  • Dresses

November

In November, San Juan Islands is brisk and very rainy. Temperatures routinely are in the high 40s F (single digits C) and about half of the time jump into the low 50s F (single digits C) range. At night, lows are in the high 30s F (single digits C).

This is also a rainy time for San Juan Islands, with more than half of the days of the month having rain. In November, humidity reaches as high as 80%.

What to wear/what to pack:

  • Fleeces
  • Waterproof footwear
  • Waterproof luggage
  • Jacket or coat
  • Umbrella
  • Light gloves or mittens
  • Socks
  • Warm pants or jeans
  • Rain coat
  • Standard footwear

December

If you go to San Juan Islands in December, you will notice that it can be very chilly and very rainy. Expect it to rain about half of the time. Daytime temperatures are in the 40s F (single digits C).

What to wear/what to pack:

  • Jacket or coat
  • Waterproof coat
  • Waterproof boots
  • Standard footwear
  • Socks
  • Fleeces
  • Warm pants or jeans
  • If you plan to ski, ski equipment
  • Umbrella
  • Light gloves or mittens

Year-round what to wear/what to pack for San Juan Islands, Washington, United States of America

Here are some general tips on what to wear in San Juan Islands, as well as several items to remember to pack when traveling there.

  • A plug adadpter that supports outlet types A and B
  • A SIM card that works in San Juan Islands

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