SeaTac, WA Weather

SeaTac, WA climate is mild during summer when temperatures tend to be in the 60's and cold during winter when temperatures tend to be in the 40's.

The warmest month of the year is August with an average maximum temperature of 75.60 degrees Fahrenheit, while the coldest month of the year is January with an average minimum temperature of 35.90 degrees Fahrenheit.

Temperature variations between night and day tend to be moderate during summer with a difference that can reach 20 degrees Fahrenheit, and fairly limited during winter with an average difference of 11 degrees Fahrenheit.

The annual average precipitation at SeaTac is 37.07 Inches. Winter months tend to be wetter than summer months. The wettest month of the year is November with an average rainfall of 5.90 Inches.

Weather Data

Weather Warnings

Wind advisory in effect from midnight tonight to 10 am pst Sunday .

Current Conditions

(Updated: 5:53 PM PST SAT NOV 21 2009)

Mostly Cloudy, 47°F	Humidity: 66%	Dewpoint: 36°F
	Wind Speed: S 17.3 MPH G 23.0 (15 MPH G 20 KT)	Heat Index: 47°F
	Barometer: 29.80 in.	Wind Chill: 40°F

Weather Forecast

(Generated: 3:30 PM PST SAT NOV 21 2009)

		Tonight: Breezy...Becoming very windy toward morning. Southeast wind 15 to 25 mph becoming east 10 to 15 mph around midnight...Then shifting to southwest 25 to 35 mph with gusts to 50 mph toward morning. Rain. Lows near 40.
	Lo: 40°F
	Hi: 49°F	Sunday: Very windy in the morning. Southwest wind 25 to 35 mph with gusts to 50 mph early. Wind easing to west 10 to 15 mph in the afternoon. Showers. Highs in the mid and upper 40s.
	Lo: 37°F
	Hi: 46°F	Monday: Rain likely. Highs in the 40s to lower 50s. South wind 10 to 15 mph.
	Lo: 40°F
	Hi: 49°F	Tuesday: Mostly cloudy with a chance of rain. Highs in the upper 40s.
	Lo: 41°F
	Hi: 51°F	Wednesday: Mostly cloudy with a chance of rain. Lows in the lower 40s. Highs in the lower 50s.
	Lo: 41°F
	Hi: 49°F	Thursday: Rain likely. Lows in the lower 40s. Highs in the upper 40s.
	Lo: 41°F
	Hi: 49°F	Friday: Rain likely. Lows in the lower 40s. Highs in the upper 40s.
	Lo: 41°F

Moon, Sunrise and Sunset

	Moon Phase: Waxing Crescent Moon	Civil Twilight: 6:47 AM PST	Sunrise: 7:21 AM PST
		Sunset: 4:27 PM PST	Civil Twilight: 5:01 PM PST

Normal Climate

Normal Temperatures

(SEATTLE TACOMA AP Weather station, 1.11 miles from SeaTac)

Month	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Annual
Max °F	45.8	49.5	53.2	58.2	64.4	69.6	75.3	75.6	70.2	59.7	50.5	45.5	59.8
Mean °F	40.9	43.3	46.2	50.2	55.8	60.7	65.3	65.6	61.1	52.7	45.2	40.7	52.3
Min °F	35.9	37.2	39.1	42.1	47.2	51.7	55.3	55.7	51.9	45.7	39.9	35.9	44.8

Normal Precipitation