Mercer Island, Washington, United States of America: What to pack, what to wear, and when to go [2018]

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

When to go to Mercer Island, Washington, United States of America

Based on the climate and weather in Mercer Island, the best time to go is July. See below for details.

What to wear/what to pack for Mercer Island, Washington, United States of America by month

January

In January, Mercer Island is cold and very rainy. Temperatures routinely are in the high 40s F (single digits C) and about a third 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).

During your visit, you can expect a couple of inches of snowfall. This is also a rainy time for Mercer Island, with more than half of the days of the month having rain.

What to wear/what to pack:

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

February

February in this region can be very chilly and somewhat rainy. Temperatures average in the low 40s F (single digits C) during the day. It rains about half of the time.

What to wear/what to pack:

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

March

If you vacation in Mercer Island during March, you are likely to find that it can be very chilly and very rainy. Temperatures tend to hover around the 50s F (low 10s C) during the day, while at night they can dip into the high 30s F (single digits C).

In terms of precipitation, you can expect it to rain about half of the time.

What to wear/what to pack:

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

April

If you visit Mercer Island during April, you are likely to find that it can be chilly and somewhat rainy. Temperatures tend to hover around the high 50s F (mid 10s C) during the day, while at night they can dip into the low 40s F (single digits C).

In terms of precipitation, you can expect it to rain about half of the time.

What to wear/what to pack:

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

May

May in Mercer Island is crisp and somewhat rainy. The rain can amount to several inches/centimeters.

During this time, temperatures average in the 60s F (high 10s C), although night temperatures can dip into the 40s F (single digits C).

What to wear/what to pack:

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

June

June in Mercer Island is mild. The rain can amount to several inches/centimeters. During this time, temperatures average in the low 60s F (low 20s C), although night temperatures can dip into the low 50s F (single digits C).

What to wear/what to pack:

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

July

July for Mercer Island is warm. Temperatures average in the 70s F (mid 20s C) during the day. It rains occasionally.

What to wear/what to pack:

  • Waterproof footwear
  • Sandals
  • Skirts
  • Rain coat
  • Waterproof luggage
  • If you're going to the beach, bathing suits, swimwear
  • Sunscreen lotion
  • Shorts or short pants
  • Umbrella
  • Light footwear
  • Long and short sleeve shirts
  • Dresses

August

Traveling to Mercer Island in August, you will notice that it is a perfect temperature. Expect it to rain once in a while. Daytime temperatures are in the 70s F (mid 20s C).

What to wear/what to pack:

  • Skirts
  • Dresses
  • Rain coat
  • Sunscreen lotion
  • Long and short sleeve shirts
  • Sandals
  • Waterproof footwear
  • Umbrella
  • Waterproof luggage
  • Shorts or short pants
  • If you're going to the beach, bathing suits, swimwear
  • Light footwear

September

If you vacation in Mercer Island during September, you are likely to find that it is mild. 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).

In terms of precipitation, you can expect it to rain regularly.

What to wear/what to pack:

  • Shorts or short pants
  • Skirts
  • Rain coat
  • Light footwear
  • Waterproof footwear
  • Long and short sleeve shirts
  • Waterproof luggage
  • Dresses
  • Sandals
  • If you're going to the beach, bathing suits, swimwear
  • Sunscreen lotion
  • Umbrella

October

If you visit Mercer Island during October, you are likely to find that it can be chilly and somewhat rainy. Temperatures tend to hover around the low 50s F (mid 10s C) during the day, while at night they can dip into the 40s F (single digits C).

In terms of precipitation, you can expect it to rain regularly.

What to wear/what to pack:

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

November

In November, Mercer Island can be very chilly and very rainy. Temperatures routinely are in the low 50s F (low 10s C) range. At night, lows are in the low 40s F (single digits C).

During your visit, you can expect a few inches of snow. This is also a rainy time for Mercer Island, with more than half of the days of the month having rain.

What to wear/what to pack:

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

December

December in Mercer Island is pretty cool and very rainy. The average overnight temperatures in the area are in the 30s F (single digits C). It tends to rain about half of the time.

What to wear/what to pack:

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

Year-round what to wear/what to pack for Mercer Island, Washington, United States of America

Here are some general tips on what to wear in Mercer Island, 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 Mercer Island

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