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Portland August Weather

Averages and records for weather in Portland, Oregon in the month of August.

Typical Portland August Weather 1991–2020
Average daily high	81.8 °F
Average daily low	58.8 °F
Average monthly precipitation	0.5 inches
Average monthly snow	none
Daily chance of precipitation	11.6%
Daily chance of snow	0%

Portland August Weather Records 1871–2024
Highest temperature	108 °F	August 14, 2023
Lowest temperature	43 °F	August 29, 1876
Highest daily low	73 °F	August 15, 2023
Lowest daily high	58 °F	August 2, 1956
Hottest average high temperature	88.1 °F	1967
Coldest average high temperature	69.1 °F	1899
Most daily precipitation	1.5 inches	August 25, 1977
Most monthly precipitation	4.5 inches	1968
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	83.0	59.5	98	47
August 2	83.1	59.5	103	50
August 3	83.1	59.5	105	47
August 4	83.1	59.5	102	46
August 5	83.1	59.5	100	46
August 6	83.1	59.4	102	47
August 7	83.0	59.4	104	48
August 8	82.9	59.3	107	45
August 9	82.8	59.3	105	46
August 10	82.6	59.2	107	46
August 11	82.5	59.1	102	48
August 12	82.3	59.0	104	47
August 13	82.3	58.9	102	45
August 14	82.2	58.9	108	47
August 15	82.1	58.9	103	49
August 16	81.9	58.9	103	47
August 17	81.8	58.8	105	45
August 18	81.6	58.7	99	45
August 19	81.4	58.5	100	45
August 20	81.3	58.4	100	46
August 21	81.3	58.3	96	45
August 22	81.2	58.2	98	46
August 23	81.1	58.1	101	48
August 24	81.0	57.9	99	46
August 25	80.9	57.8	95	46
August 26	80.7	57.7	100	44
August 27	80.6	57.5	98	46
August 28	80.4	57.4	102	43
August 29	80.2	57.2	95	43
August 30	80.0	57.0	100	44
August 31	79.8	56.9	102	44

Weather Station Details

Years	Station	Coordinates
1939–2024	Portland International Airport	location
1871–1938	Portland RFC	location