Issaquah, WA Weather - Forecast & Monthly Averages

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TEMPERATURE	60
HUMIDITY	69
PRESSURE	101560
WIND COND.	288

Weather Quick Facts

The highest monthly average temperature in Issaquah for August is 67.5 degrees
The lowest monthly average temperature in Issaquah for December is 40.6 degrees
The most monthly precipitation in Issaquah occurs in November with 5.7 inches
The air quality index in Issaquah is 7% worse than the national average
The pollution index in Issaquah is 60% better than the national average

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Issaquah Average Temperature

In the event that the weather data was unavailable for this city, estimates based upon nearby cities were used.
Month	Temp. _(min)	Temp. _(max)	Temp. _(avg)	Precipitation
January	36°F	48°F	41°F	4.7"
February	37°F	51°F	44°F	3.2"
March	40°F	55°F	46°F	4.5"
April	43°F	61°F	50°F	2.9"
May	48°F	68°F	57°F	2.1"
June	53°F	73°F	62°F	1.6"
July	58°F	80°F	67°F	0.5"
August	58°F	80°F	67°F	0.9"
September	53°F	73°F	62°F	1.8"
October	47°F	62°F	53°F	3.9"
November	40°F	53°F	46°F	5.7"
December	36°F	47°F	41°F	4.5"

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Issaquah air quality index & pollution index

In the event that the air quality/pollution data was unavailable for this city, estimates based upon nearby cities were used.
Index	Issaquah	Washington	National
Air quality index	45	36	42
Pollution index	1,081,430	4,541,850	2,726,193

Issaquah air quality

Measurement	Total
Days measured	365
Days with good air quality	236
Days with moderate air quality	127
Days w/ poor A.Q. for sensitive groups	2
Days with unhealthy air quality	0

Air quality details

Pollutant	Total
Arsenic	0.000%
Benzene	0.010%
Carbon Tetrachloride	0.000%
Lead	0.000%
Mercury	0.000%

Average monthly Issaquah temperature with heat index

Issaquah monthly precipitation with daily maximum

Issaquah monthly snow depth with daily maximum

Issaquah monthly wind speed information

Nearby cities with good air quality

City	Population	Air Quality Index	National Avg.
Fairwood, WA	19,921	45	10.0%
Cottage Lake, WA	23,962	45	10.0%
Hobart, WA	7,243	45	10.0%
Boulevard Park, WA	4,347	45	10.0%
SeaTac, WA	30,186	45	10.0%
Issaquah, WA	39,876	45	10.0%

Cities with similar population

City	Population	Air Quality Index	National Avg.
Sun City, AZ	39,873	74	48.0%
Evans, GA	39,854	47	6.0%
Wausau, WI	39,898	34	32.0%
Wheeling, IL	39,851	55	10.0%
Martinez, CA	39,841	40	20.0%
Issaquah, WA	39,876	45	10.0%

Source: The Issaquah, WA weather data displayed above is derived from the NOAA (National Oceanic and Atmospheric). Air quality and pollution data is derived from the EPA (United States Environmental Protection Agency). Air quality and pollution levels measured in a particular area may not be representative of the entire county.