Climate in Issaquah, Washington

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.

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.

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