Weather Averages for Seatac, WA

7-day Forecast / 10-day Forecast

Monday
	High: 46°F Low: 34°F
Light drizzle

Tuesday
	High: 42°F Low: 32°F
Overcast

Wednesday
	High: 44°F Low: 34°F
Sunny

Thursday
	High: 45°F Low: 33°F
Sunny

Friday
	High: 53°F Low: 37°F
Sunny

Latitude: 47°27'N, Longitude: 122°18'W, Elevation: 450.0 ft, Distance: 1.07 mi Seatac, WA Averages »

	Unit	Year	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Average temperature over 48 years	°F	51	39	43	44	48	55	60	64	64	60	53	44	41
Average high temperature over 48 years	°F	59	44	48	51	57	64	69	75	75	69	60	50	44
Average low temperature over 48 years	°F	44	35	37	37	41	46	51	53	55	51	44	39	36
Highest recorded temperature over 48 years	°F	100	64	69	75	84	93	96	100	98	98	89	73	64
Lowest recorded temperature over 48 years	°F	-	-	1	10	28	28	37	43	44	35	28	6	6
Average number of rainy days over 49 years	days	154	18	16	17	14	10	9	5	6	9	13	18	19
Average number of days above 90°F over 48 years	days	3	-	-	-	-	-	-	1	1	-	-	-	-
Average precipitation over 48 years	in	38.0	5.6	4.1	3.7	2.5	1.7	1.5	0.8	1.1	1.8	3.4	5.9	5.8
Average dew point over 48 years	°F	43	33	35	36	39	44	48	51	53	50	44	39	35
Most recorded rainfall over 48 years	in	55.1	12.9	9.1	8.4	6.5	4.8	3.8	2.4	4.6	5.9	7.8	10.7	11.8
Least recorded rainfall over 48 years	in	23.7	0.6	0.3	0.6	0.3	0.1	0.1	-	-	-	0.3	0.7	1.4
Average number of days with thunderstorms over 48 years	days	8	-	-	1	1	1	1	1	1	1	-	1	-
Average number of days with fog over 48 years	days	164	18	15	13	10	8	8	8	11	16	19	19	19
Average morning relative humidity over 48 years	%	83	83	83	84	83	80	79	79	83	88	88	86	85
Average evening relative humidity over 48 years	%	62	75	69	63	57	54	53	49	51	56	68	76	79
Average wind speed over 48 years	mph	10.0	11.0	10.0	12.0	11.0	10.0	9.0	9.0	9.0	9.0	10.0	11.0	11.0
Average number of days below 32°F over 48 years	days	36	11	7	4	1	-	-	-	-	-	-	4	9
Average snowfall over 49 years	in	11.8	5.0	1.6	1.4	0.1	-	-	-	-	-	-	1.2	2.5
Average number of days above 65°F over 48 years	days	127	-	-	1	5	13	21	29	29	22	6	-	-
Average number of clear days over 49 years	days	58	3	3	3	3	4	5	10	9	8	4	3	2
Heating degree days over 30 years	days	4908	772	602	601	474	307	144	58	65	156	378	591	760
Cooling degree days over 30 years	days	190	-	-	-	-	-	21	64	81	24	-	-	-
Average possibility of sunshine over 27 years	%	47	26	39	49	52	55	56	64	65	61	43	28	22
Average number of cloudy days over 49 years	days	226	24	21	22	20	18	17	11	12	13	20	23	25
Average number of partly cloudy days over 49 years	days	81	4	4	6	7	9	8	10	10	9	7	4	4

Check weather averages for nearby locations (some locations might offer more data):

Latitude: 47°26'N, Longitude: 122°18'W, Elevation: 380.0 ft, Distance: 1.46 mi

Latitude: 47°32'N, Longitude: 122°18'W, Elevation: 30.0 ft, Distance: 6.00 mi

Latitude: 47°23'N, Longitude: 122°14'W, Elevation: 30.0 ft, Distance: 6.11 mi

Latitude: 47°30'N, Longitude: 122°30'W, Elevation: 230.0 ft, Distance: 9.03 mi

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