Issaquah, WA Climate


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United States / Washington / Seattle-Tacoma-Bellevue Metro Area / King County / Issaquah / Zip Codes
Issaquah, WA is located in the Puget Sound region which has a temperate climate. This means there is relatively little temperature variation from season to season and temperatures remain mild all year round. The average summertime high temperature for Issaquah is 73 degrees Fahrenheit and the average wintertime low temperature is 37 degrees Fahrenheit. Rainfall in Issaquah averages approximately 38 inches per year, with most of the precipitation coming during the fall months when storms can sweep through the region. Overall, Issaquah enjoys a pleasant climate with warmer temperatures in the summer and cooler temperatures during winter.

Issaquah, Washington gets 53 inches of rain, on average, per year. The US average is 38 inches of rain per year.

Issaquah averages 6 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 154 sunny days per year in Issaquah. The US average is 205 sunny days.

Issaquah gets some kind of precipitation, on average, 173 days per year. Precipitation is rain, snow, sleet, or hail that falls to the ground. In order for precipitation to be counted you have to get at least .01 inches on the ground to measure.

Weather Highlights

Summer High: the July high is around 76 degrees
Winter Low: the January low is 35
Rain: averages 53 inches of rain a year
Snow: averages 6 inches of snow a year

Bestplaces Comfort Index

The annual BestPlaces Comfort Index for Issaquah is 7.1 (10=best), which means it is about average compared to other places in Washington.

9.1 Summer - 5.2 Winter
August, July and September are the most pleasant months in Issaquah, while December and January are the least comfortable months.

  ClimateIssaquah, WashingtonUnited States
  52.6 in.38.1 in.
  6.2 in.27.8 in.
  173.4 days106.2 days
  154 days205 days
  75.6°85.8°
  35.3°21.7°
  7.17
  2.64.3
  108 ft.2443 ft.
Climate
YOU SHOULD KNOW

Many people confuse weather and climate but they are different. Weather is the conditions of the atmosphere over a short period of time, and climate is how the atmosphere is over long periods of time.

Weather is how the atmosphere is behaving and its effects upon life and human activities. Weather can change from minute-to-minute. Most people think of weather in terms of temperature, humidity, precipitation, cloudiness, brightness, visibility, wind, and atmospheric pressure.

Climate is the description of the long-term pattern of weather in a place. Climate can mean the average weather for a particular region and time period taken over 30 years. Climate is the average of weather over time.

August is the hottest month for Issaquah with an average high temperature of 76.1°, which ranks it as cooler than most places in Washington. In Issaquah, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Issaquah are August, July and September.
In Issaquah, there are 3.1 days annually when the high temperature is over 90°, which is about average compared to other places in Washington.
December has the coldest nighttime temperatures for Issaquah with an average of 33.9°. This is warmer than most places in Washington.
In Issaquah, there are 43.1 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Washington.
In Issaquah, there are 0.0 days annually when the nighttime low temperature falls below zero°, which is about average compared to other places in Washington.
Humidity in Issaquah is generally quite low and comfortable. There are few days during the summer when the humidity becomes unpleasant. The most humid months (but still comfortable) are July, August and September.
November is the wettest month in Issaquah with 8.6 inches of rain, and the driest month is July with 1.2 inches. The wettest season is Spring with 36% of yearly precipitation and 10% occurs in Autumn, which is the driest season. The annual rainfall of 52.6 inches in Issaquah means that it is wetter than most places in Washington.
November is the rainiest month in Issaquah with 20.4 days of rain, and August is the driest month with only 5.7 rainy days. There are 173.4 rainy days annually in Issaquah, which is rainier than most places in Washington. The rainiest season is Spring when it rains 31% of the time and the driest is Autumn with only a 14% chance of a rainy day.
An annual snowfall of 6.2 inches in Issaquah means that it is about average compared to other places in Washington. December is the snowiest month in Issaquah with 1.9 inches of snow, and 5 months of the year have significant snowfall.
Reviews for Issaquah
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Paul · Sequim, WA
Nice If You're Into Fakery
Over 3 years ago

Great place if you enjoy living in a city of cloned homes, cars, and humans with no souls. You know the ones. Why show off your new Mercedes, Land Rover or Porsche when  More

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Ann · Bellevue, WA
Lot's of changes but still fun
Over 4 years ago

I lived in Issaquah for close to 30 years. I have seen a lot of changes in the city - some good and some not so good. I was very sad to leave and even sorrier to have  More

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Donald · Sequim, WA
Issaquah has vanished.
Over 5 years ago

Issaquah WAS a 5-star place to live, play, work, own a home, and raise a family. That was up until the late '70s and early 80s. Issaquah was a country utopia for over a  More

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