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Ketchikan September Weather

Averages and records for weather in Ketchikan, Alaska in the month of September.

Typical Ketchikan September Weather 1991–2020
Average daily high	59.0 °F
Average daily low	47.9 °F
Average monthly precipitation	14.4 inches
Daily chance of precipitation	64.8%

Ketchikan September Weather Records 1910–2024
Highest temperature	80 °F	September 5, 2017
Lowest temperature	28 °F	September 22, 1926
Highest daily low	61 °F	September 8, 1930
Lowest daily high	45 °F	September 29, 1917
Hottest average high temperature	67.6 °F	1918
Coldest average high temperature	54.7 °F	1992
Most daily precipitation	7.6 inches	September 22, 1949
Most monthly precipitation	28.3 inches	2011

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

Day	Average (°F)		Record (°F)
Day	High	Low	High	Low
September 1	61.6	50.5	80	36
September 2	61.5	50.2	79	36
September 3	61.2	50.1	76	41
September 4	61.1	49.9	80	36
September 5	60.9	49.6	80	36
September 6	60.8	49.5	77	37
September 7	60.6	49.3	74	34
September 8	60.5	49.1	78	37
September 9	60.3	49.0	77	37
September 10	60.1	48.9	76	36
September 11	59.9	48.8	79	34
September 12	59.7	48.6	77	32
September 13	59.5	48.4	76	34
September 14	59.3	48.2	79	32
September 15	59.1	48.0	80	32
September 16	58.9	47.8	75	30
September 17	58.7	47.5	78	32
September 18	58.5	47.2	77	29
September 19	58.2	46.9	79	36
September 20	58.0	46.7	73	36
September 21	57.7	46.5	74	28
September 22	57.5	46.3	73	28
September 23	57.2	46.1	76	29
September 24	57.0	45.8	72	30
September 25	56.7	45.6	73	31
September 26	56.4	45.3	67	29
September 27	56.1	45.0	73	34
September 28	55.8	44.8	72	33
September 29	55.5	44.6	74	32
September 30	55.2	44.4	70	32

Weather Station Details

Years	Station	Coordinates
1910–2024	Ketchikan International Airport	location