Portage Bay, Seattle, WA Weather - Forecast & Monthly Averages

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Weather Quick Facts

The highest monthly average temperature in Portage Bay for August is 67.5 degrees
The lowest monthly average temperature in Portage Bay for December is 41.4 degrees
The most monthly precipitation in Portage Bay occurs in November with 6.6 inches
The air quality index in Portage Bay is 7% worse than the national average
The pollution index in Portage Bay is 60% better than the national average

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Portage Bay 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	49°F	42°F	5.1"
February	37°F	52°F	44°F	3.8"
March	40°F	55°F	47°F	4.9"
April	43°F	61°F	51°F	3.1"
May	49°F	68°F	57°F	2.2"
June	54°F	72°F	62°F	1.5"
July	58°F	79°F	67°F	0.4"
August	58°F	79°F	68°F	0.6"
September	54°F	73°F	62°F	1.6"
October	47°F	62°F	54°F	3.9"
November	40°F	53°F	47°F	6.6"
December	36°F	48°F	41°F	6.1"

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Portage Bay 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	Portage Bay	Seattle	Washington
Air quality index	45	45	36
Pollution index	1,081,430	1,081,430	4,541,850

Portage Bay 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 Portage Bay temperature with heat index

Portage Bay monthly precipitation with daily maximum

Portage Bay monthly snow depth with daily maximum

Portage Bay monthly wind speed information

Nearby cities with good air quality

City	Population	Air Quality Index	National Avg.
Enetai, WA	1,993	18	64.0%
Parkwood, WA	6,758	18	64.0%
Bethel, WA	4,182	18	64.0%
Bremerton, WA	41,258	18	64.0%
Keyport, WA	339	18	64.0%
Seattle, WA	741,251	45	10.0%

Cities with similar population

City	Population	Air Quality Index	National Avg.
Brampton, ON	735,754	n/a
Mississauga, ON	764,342	n/a
Denver, CO	715,878	58	16.0%
Winnipeg, MB	775,440	n/a
Washington, DC	701,974	47	6.0%
Seattle, WA	741,251	45	10.0%

Source: The Portage Bay, Seattle, 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.