Lewiston, ID: September

30 September 2026: September 2026 averaged 63.3°F in Lewiston, ID, the coldest September since 2005, 47th coldest of 133.

September 2026

Mean temperature: 63.3°F; Coldest since 2005; 47th coldest of 133
Precipitation: 1.63 in; Wettest since 2000; 14th wettest of 134

A normal September in Lewiston, ID (1991 to 2020): a mean temperature of 65.5°F, between 62.9°F and 68.2°F in eight years of ten and 0.43 in of precipitation, between 0.07 in and 1.25 in in eight years of ten.

The mean temperature of every September in Lewiston, ID since 1881: 63.3°F in 2026; the lowest is 56.8°F, in 1985.

Normal range, 62.9 to 68.2°F

Every year, ranked, as a table

Every September in Lewiston, ID from 1881 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	Days missing
2026	63.3	87	74.9	105	51.6	39	1.63	14	0
2025	71.4	3	84.8	7	57.9	1	1.24	30	0
2024	70	4	83	20	57	3	0.82	54	0
2023	66.4	33	78.5	67	54.2	14	1.04	37	0
2022	68.9	11	82.5	26	55.3	9	1.38	23	0
2021	66.7	30	80	42	53.4	21	0.69	64	0
2020	67.6	24	82.2	28	53	25	0.28	105	0
2019	65.3	52	76.6	88	54	16	1.05	36	0
2018	63.6	82	77.6	76	49.6	79	0.04	127	0
2017	66.2	37	78.7	63	53.8	17	0.56	78	1
2016	64.3	65	76.6	88	52	36	0.55	79	0
2015	63.9	76	77.2	83	50.6	60	0.65	69	0
2014	67.7	23	81.9	30	53.5	19	0.25	109	0
2013	68	21	79.2	56	56.8	4	1.57	17	0
2012	68.3	14	83.9	12	52.8	27	trace	132	0
2011	69.4	7	85.4	6	53.5	19	0.14	119	0
2010	65.1	55	77.5	80	52.8	27	0.70	63	0
2009	68.2	16	83.1	19	53.2	24	0.09	124	0
2008	65.5	46	80	42	51	49	0.75	57	0
2007	64.5	62	78.6	65	50.4	64	0.10	121	0
2006	65.4	51	79.7	51	51.1	47	0.66	67	0
2005	63	90	76.6	88	49.4	82	0.17	117	0
2004	63.5	84	75.6	100	51.4	42	0.33	102	0
2003	66.5	32	80.2	40	52.8	27	1.06	34	0
2002	64.2	68	77.6	76	50.7	59	0.38	94	0
2001	68.1	17	82.8	22	53.4	21	0.19	115	0
2000	61.1	110	71.9	120	50.3	65	2.48	4	0
1999	64.1	72	79.1	59	49	89	trace	132	0
1998	69.3	8	82.7	24	55.8	6	1.90	12	0
1997	66.4	33	79.2	56	53.7	18	0.98	43	0
1996	61.8	104	74.2	111	49.3	84	0.47	91	0
1995	66.3	36	79.6	52	52.9	26	1.21	31	0
1994	67.4	26	81.4	34	53.4	21	0.37	96	0
1993	64.7	57	79.6	52	49.7	74	0.07	125	0
1992	62.3	98	75.1	103	49.6	79	0.84	51	0
1991	65.5	46	80.1	41	51	49	0.24	110	0
1990	73	1	88	2	57.9	1	0.04	127	0
1989	66	41	79.8	49	52.3	32	0.64	70	0
1988	64.2	68	78.1	72	50.3	65	0.82	54	0
1987	68.3	14	83.8	13	52.7	30	0.01	131	0
1986	59.4	125	69.8	131	49	89	0.94	47	0
1985	56.8	133	66.8	133	46.8	120	1.82	13	0
1984	61.5	106	74.5	107	48.4	97	0.21	114	0
1983	60.7	115	74.4	109	47	117	0.74	58	0
1982	63.9	76	76.9	85	50.9	54	0.97	45	0
1981	65.5	46	79.9	45	51.1	47	1.01	40	0
1980	64	74	77	84	50.9	54	0.97	45	0
1979	69	9	83.8	13	54.1	15	0.18	116	0
1978	61.9	102	72.7	118	51	49	1.06	34	0
1977	61.3	108	71.6	125	51	49	2.22	6	0
1976	69	9	83.3	16	54.6	11	0.33	102	0
1975	66.2	37	82.3	27	50	70	trace	132	0
1974	66.2	37	82.2	28	50.3	65	0.10	121	0
1973	64.7	57	77.6	76	51.8	37	1.12	33	0
1972	60.4	118	73.1	117	47.6	111	0.83	52	0
1971	58.5	129	71.9	120	45.2	132	1.57	17	0
1970	58.2	131	70.4	130	45.9	127	1.29	26	0
1969	64.3	65	76.3	93	52.2	34	1.38	23	0
1968	62.9	92	74.5	107	51.2	45	1.27	28	0
1967	69.5	6	84.4	9	54.6	11	0.60	73	0
1966	68.6	13	82.6	25	54.6	11	0.22	113	0
1965	59.2	126	72.2	119	46.1	125	0.28	105	0
1964	60.7	115	73.9	113	47.5	113	0.87	49	0
1963	69.8	5	84.4	9	55.1	10	0.52	80	0
1962	64.2	68	78.6	65	49.7	74	0.83	52	0
1961	59.7	122	73.3	116	46.1	125	0.51	82	0
1960	63.9	76	79.6	52	48.3	98	0.69	64	0
1959	59.5	124	70.8	129	48.2	101	1.93	10	0
1958	62.4	97	75.6	100	49.1	88	0.37	96	0
1957	65.9	42	81.8	31	50	70	0.12	120	0
1956	62.8	93	78.1	72	47.5	113	0.23	112	0
1955	61.9	102	76.9	85	46.9	118	1.96	9	0
1954	61.1	110	75.7	98	46.4	122	1.01	40	0
1953	66.2	37	82.8	22	49.7	74	0.04	127	0
1952	65.7	43	81.6	32	49.7	74	0.64	70	0
1951	63.6	82	79.3	55	47.9	107	0.34	100	0
1950	64.3	65	79.8	49	48.8	93	0.49	85	0
1949	64.6	59	79.1	59	50.1	69	1.31	25	0
1948	62.5	95	77.4	81	47.6	111	0.49	85	0
1947	63.8	80	76.3	93	51.3	43	2.36	5	0
1946	62.6	94	76.8	87	48.3	98	2.21	7	0
1945	60.2	119	74.7	106	45.6	129	1.91	11	0
1944	68.7	12	86.7	5	50.6	60	0.49	85	0
1943	67.9	22	87.6	3	48.2	101	0.50	84	2
1942	65.5	46	83.2	18	47.8	110	0.38	94	0
1941	60.1	120	71.6	125	48.6	94	1.29	26	0
1940	68.1	17	79.9	45	56.3	5	4.37	1	0
1939	67.4	26	84.3	11	50.5	63	0.15	118	0
1938	72.4	2	89.2	1	55.6	7	0.71	61	0
1937	67.6	24	84.7	8	50.6	60	0.33	102	0
1936	63.1	88	79.9	45	46.3	123	0.71	61	0
1935	68.1	17	87.2	4	48.9	91	0.24	110	0
1934	61.4	107	78.3	69	44.4	133	0.28	105	0
1932	64.2	68	81.5	33	46.9	118	0.07	125	0
1931	64.5	62	78.3	69	50.8	57	0.73	59	0
1930	65.3	52	78.9	62	51.8	37	0.88	48	0
1929	61.1	110	75	104	47.3	116	0.39	93	0
1928	64.6	59	81.2	35	48	105	0.26	108	0
1927	60.6	117	71.4	128	49.7	74	3.10	2	0
1926	59.1	127	71.9	120	46.2	124	1.50	19	0
1925	65	56	79	61	51	49	0.48	90	0
1924	64.4	64	80	42	48.9	91	0.49	85	0
1923	66.4	33	83.3	16	49.4	82	0.10	121	0
1922	67.3	28	83.8	13	50.8	57	0.51	82	0
1921	58.6	128	71.5	127	45.6	129	0.79	56	0
1920	63.5	84	77.3	82	49.6	79	1.25	29	0
1919	63.1	88	78	74	48.1	103	0.73	59	0
1918	67.3	28	83	20	51.5	40	0.37	96	0
1917	66.7	30	81.1	36	52.2	34	2.14	8	0
1916	63	90	78.5	67	47.5	113	0.45	92	0
1915	62.2	100	76.4	92	48	105	0.49	85	0
1914	62.2	100	76.1	96	48.3	98	0.62	72	0
1913	63.9	76	79.9	45	47.9	107	0.60	73	0
1912	59.6	123	73.8	114	45.4	131	0.98	43	0
1911	61.3	108	74	112	48.5	95	0.52	80	0
1910	62.3	98	75.2	102	49.3	84	1.48	20	0
1909	65.5	46	78.7	63	52.4	31	1.43	21	0
1908	65.2	54	79.2	56	51.2	45	1.60	16	1
1907	62.5	95	75.7	98	49.3	84	0.86	50	0
1906	65.6	44	80.4	39	50.9	54	0.57	77	0
1905	64.6	59	78	74	51.3	43	2.74	3	0
1904	65.6	44	80.9	37	50.2	68	0.58	75	0
1903	61.7	105	74.3	110	49.2	87	1.02	39	0
1902	63.4	86	78.3	69	48.5	95	0.34	100	0
1901	60.8	114	71.7	123	49.9	72	1.62	15	0
1899	63.8	80	77.6	76	49.9	72	0.58	75	0
1898	68.1	17	80.8	38	55.4	8	0.35	99	0
1895	58.5	129	73.6	115	43.4	134	1.39	22	0
1894	60.9	113	76.2	95	45.7	128	1.03	38	0
1885	64	74	76.5	91	51.5	40	0.66	67	0
1884	57.7	132	68.9	132	46.6	121	1.01	40	0
1883					47.9	107	0.04	127	4
1882	64.1	72	76	97	52.3	32	0.69	64	0
1881	59.9	121	71.7	123	48.1	103	1.17	32	0

Warmest, coldest, wettest and driest

Warmest
Year	Mean, °F
1990	73
1938	72.4
2025	71.4
2024	70
1963	69.8
1967	69.5
2011	69.4
1998	69.3
1979	69
1976	69

Coldest
Year	Mean, °F
1985	56.8
1884	57.7
1970	58.2
1971	58.5
1895	58.5
1921	58.6
1926	59.1
1965	59.2
1986	59.4
1959	59.5

Wettest
Year	Precipitation, in
1940	4.37
1927	3.10
1905	2.74
2000	2.48
1947	2.36
1977	2.22
1946	2.21
1917	2.14
1955	1.96
1959	1.93

Driest
Year	Precipitation, in
2012	trace
1999	trace
1975	trace
1987	0.01
2018	0.04
1990	0.04
1953	0.04
1883	0.04
1993	0.07
1932	0.07

The hottest, coldest and wettest days

Hottest day: 88°F; 10 September 2026
Coldest night: 41°F; 28 September 2026
Wettest day: 0.71 in; 13 September 2026

Every month, season and year

Months

Seasons

Years

Lewiston, ID the day's answers

All-time records

Every answer in words

September 2026 brought 1.63 in of precipitation in Lewiston, ID, the wettest September since 2000, 14th wettest of 134.
The hottest day of September 2026 in Lewiston, ID: 88°F on Thursday 10 September 2026.
The coldest night of September 2026 in Lewiston, ID: a low of 41°F on Monday 28 September 2026.
The wettest day of September 2026 in Lewiston, ID: 0.71 in on Sunday 13 September 2026.