Seattle Tacoma, WA: September

30 September 2026: September 2026 averaged 60.3°F in Seattle Tacoma, WA, the coldest September since 2007, 37th coldest of 82.

September 2026

Mean temperature: 60.3°F; Coldest since 2007; 37th coldest of 82
Precipitation: 1.46 in; Driest since 2025; 40th driest of 82

A normal September in Seattle Tacoma, WA (1991 to 2020): a mean temperature of 62.3°F, between 59.8°F and 64.3°F in eight years of ten and 1.09 in of precipitation, between 0.16 in and 3.33 in in eight years of ten.

The mean temperature of every September in Seattle Tacoma, WA since 1945: 60.3°F in 2026; the lowest is 55.3°F, in 1972.

Normal range, 59.8 to 64.3°F

Every year, ranked, as a table

Every September in Seattle Tacoma, WA from 1945 to 2026, ranked: the mean temperature, the mean high and the mean low from the warmest, the precipitation from the wettest; a year missing more than a tenth of its days is not ranked.

Year	Mean, °F	Rank	High, °F	Rank	Low, °F	Rank	Precipitation, in	Rank
2026	60.3	46	68	58	52.7	30	1.46	43
2025	64.1	8	73.1	18	55.2	6	0.76	63
2024	62.6	21	70.5	32	54.7	10	0.62	67
2023	62	30	70.6	30	53.4	22	3.44	10
2022	64.8	3	74.6	4	55.1	7	0.25	75
2021	61.9	31	70.3	36	53.4	22	3.02	16
2020	65.5	2	74.3	5	56.7	1	2.48	20
2019	62.8	17	69.4	44	56.1	3	3.32	13
2018	62.3	27	70.5	32	54.1	16	1.04	54
2017	64.7	5	73.8	6	55.6	5	0.59	68
2016	61.2	35	69.6	41	52.9	28	1.05	53
2015	60.5	44	68.5	52	52.5	33	0.83	60
2014	64.8	3	73.7	8	55.8	4	2.23	25
2013	63.5	12	70.4	35	56.5	2	6.17	1
2012	62.7	19	73.2	17	52.2	40	0.03	79
2011	64	9	73.5	9	54.5	12	1.29	48
2010	60.9	38	67.3	62	54.4	13	4.80	4
2009	62.4	26	71.6	23	53.2	25	1.75	37
2008	61	36	69.8	39	52.2	40	0.78	62
2007	59.9	49	67.4	60	52.5	33	3.16	15
2006	62.3	27	72.4	21	52.2	40	1.43	44
2005	59.5	56	68.1	56	50.9	57	0.75	65
2004	58.8	64	65.3	79	52.3	35	2.80	17
2003	62.6	21	71.7	22	53.5	19	0.89	59
2002	60.6	42	70.1	38	51.1	51	0.42	73
2001	59.8	51	67.7	59	51.8	44	0.83	60
2000	60.2	47	68.6	50	51.8	44	1.12	52
1999	60.8	40	70.9	25	50.7	58	0.17	77
1998	63.1	15	73.1	18	53.1	26	0.72	66
1997	62.2	29	70.8	28	53.5	19	3.41	12
1996	59.2	57	67.3	62	51.1	51	1.85	32
1995	64	9	73.4	12	54.6	11	0.91	57
1994	64.3	7	73.8	6	54.9	9	1.69	39
1993	61.8	32	73.5	9	50.2	65	0.03	79
1992	60	48	69.3	46	50.7	58	1.15	51
1991	62.8	17	73.4	12	52.3	35	trace	81
1990	63.4	14	72.9	20	53.9	17	0.05	78
1989	64	9	75.1	3	53	27	0.54	70
1988	60.5	44	70.9	25	50.1	67	1.75	37
1987	62.5	24	73.3	14	51.8	44	0.91	57
1986	59.1	59	67.1	64	51.1	51	1.89	31
1985	58.1	73	65.9	75	50.3	64	1.98	29
1984	59.9	49	68.3	53	51.4	50	1.01	55
1983	58.3	71	66.1	73	50.4	62	1.85	32
1982	60.6	42	68.8	49	52.3	35	1.49	42
1981	61	36	70.5	32	51.6	48	3.42	11
1980	59.6	54	67.4	60	51.8	44	1.43	44
1979	62.6	21	70.9	25	54.3	14	2.07	27
1978	58.8	64	65.3	79	52.3	35	5.95	2
1977	58.9	63	66.8	66	51	55	2.55	19
1976	62.5	24	70.8	28	54.3	14	1.25	49
1975	63	16	73.3	14	52.6	32	trace	81
1974	64.4	6	76	2	52.7	30	0.21	76
1973	61.8	32	70.3	36	53.4	22	1.81	35
1972	55.3	82	63.1	82	47.6	80	4.10	6
1971	57.6	77	65.5	77	49.6	69	3.51	8
1970	58.6	69	66.2	71	51	55	2.23	25
1969	60.9	38	69	48	52.9	28	5.57	3
1968	59.1	59	65.8	76	52.3	35	1.93	30
1967	65.7	1	76.4	1	55	8	0.94	56
1966	61.5	34	69.4	44	53.5	19	1.77	36
1965	58.3	71	66.5	67	50.2	65	0.49	71
1964	58.5	70	66.4	70	50.5	60	2.27	24
1963	63.5	12	73.3	14	53.7	18	0.59	68
1962	59.6	54	69.1	47	50.1	67	2.31	22
1961	58.7	66	68.3	53	49.1	73	0.46	72
1960	58	74	66.5	67	49.5	71	1.17	50
1959	57.4	78	64.4	81	50.4	62	4.60	5
1958	59.8	51	68.1	56	51.5	49	1.42	47
1957	62.7	19	73.5	9	51.9	43	0.76	63
1956	57.9	75	66.5	67	49.3	72	2.42	21
1955	57	80	66	74	47.9	77	1.52	41
1954	58.7	66	66.2	71	51.1	51	1.68	40
1953	59.7	53	69.7	40	49.6	69	3.28	14
1952	59.2	57	70.6	30	47.7	79	0.32	74
1951	59	62	69.5	42	48.6	76	2.03	28
1950	57.8	76	68.3	53	47.3	81	2.30	23
1949	60.8	40	71	24	50.5	60	1.43	44
1948	57.1	79	67.1	64	47.2	82	3.85	7
1947	59.1	59	69.5	42	48.8	74	1.84	34
1946	58.7	66	68.6	50	48.7	75	2.58	18
1945	56.7	81	65.5	77	47.9	77	3.51	8

Warmest, coldest, wettest and driest

Warmest
Year	Mean, °F
1967	65.7
2020	65.5
2022	64.8
2014	64.8
2017	64.7
1974	64.4
1994	64.3
2025	64.1
2011	64
1995	64
More years share the last value

Coldest
Year	Mean, °F
1972	55.3
1945	56.7
1955	57
1948	57.1
1959	57.4
1971	57.6
1950	57.8
1956	57.9
1960	58
1985	58.1

Wettest
Year	Precipitation, in
2013	6.17
1978	5.95
1969	5.57
2010	4.80
1959	4.60
1972	4.10
1948	3.85
1971	3.51
1945	3.51
2023	3.44

Driest
Year	Precipitation, in
1991	trace
1975	trace
2012	0.03
1993	0.03
1990	0.05
1999	0.17
1974	0.21
2022	0.25
1952	0.32
2002	0.42

The hottest, coldest and wettest days

Hottest day: 78°F; 9 September 2026
Coldest night: 46°F; 28 September 2026
Wettest day: 0.55 in; 13 September 2026

Every month, season and year

Months

Seasons

Years

Seattle Tacoma, WA the day's answers

All-time records

Every answer in words

September 2026 brought 1.46 in of precipitation in Seattle Tacoma, WA, the driest September since 2025, 40th driest of 82.
The hottest day of September 2026 in Seattle Tacoma, WA: 78°F on Wednesday 9 September 2026.
The coldest night of September 2026 in Seattle Tacoma, WA: a low of 46°F on Monday 28 September 2026.
The wettest day of September 2026 in Seattle Tacoma, WA: 0.55 in on Sunday 13 September 2026.