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Seattle August Weather

Averages and records for weather in Seattle, Washington in the month of August.

Typical Seattle August Weather 1991–2020
Average daily high	76.7 °F
Average daily low	56.8 °F
Average monthly precipitation	1.0 inches
Average monthly snow	none
Daily chance of precipitation	15.9%
Daily chance of snow	0%

Seattle August Weather Records 1894–2024
Highest temperature	99 °F	August 9, 1981
Lowest temperature	44 °F	August 14, 1955
Highest daily low	71 °F	August 14, 2023
Lowest daily high	54 °F	August 2, 1956
Hottest average high temperature	83.7 °F	1967
Coldest average high temperature	67.6 °F	1899
Most daily precipitation	1.6 inches	August 18, 1975
Most monthly precipitation	4.6 inches	1975
Most daily snow	none	-
Most monthly snow	none	-

Note: Daily averages are a moving average which includes 14 days before and after

Day	Average (°F)		Record (°F)
Day	High	Low	High	Low
August 1	77.9	57.2	92	50
August 2	78.0	57.2	91	46
August 3	78.0	57.3	94	46
August 4	78.0	57.2	95	44
August 5	78.0	57.2	93	49
August 6	78.0	57.2	91	50
August 7	77.9	57.1	95	48
August 8	77.8	57.1	98	47
August 9	77.7	57.1	99	47
August 10	77.5	57.0	98	46
August 11	77.4	57.0	96	46
August 12	77.3	56.9	96	49
August 13	77.2	56.9	92	44
August 14	77.1	56.8	95	44
August 15	77.0	56.8	96	47
August 16	76.9	56.8	98	48
August 17	76.7	56.8	96	45
August 18	76.5	56.7	89	47
August 19	76.3	56.6	95	47
August 20	76.2	56.5	91	47
August 21	76.1	56.4	91	46
August 22	76.1	56.4	89	45
August 23	76.0	56.3	91	46
August 24	75.8	56.2	88	45
August 25	75.6	56.1	91	45
August 26	75.5	56.0	92	46
August 27	75.3	55.9	88	44
August 28	75.1	55.8	95	46
August 29	74.9	55.7	91	44
August 30	74.7	55.5	95	45
August 31	74.5	55.4	92	46

Weather Station Details

Years	Station	Coordinates
1948–2024	Seattle Tacoma International Airport	location
1894–1947	University of Washington	location