Average September Temperature in Lewiston by Year

This page contains a list of the average monthly high and low temperatures in Lewiston, Idaho for the month of September each year between 1894 and 2023. It is based on NOAA data.

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Month:

What Was the Hottest September Ever in Lewiston?

1990 was the warmest September in the history of Lewiston, Idaho. The average daily high temperature was 88.0 °F, and the average low was 57.9 °F.

What Was the Coldest September Ever in Lewiston?

1985 was the coolest September in the history of Lewiston, Idaho. The average daily high temperature was 66.8 °F, and the average low was 46.8 °F.

* click column headers to sort

Year	Rank	High (°F)	Low (°F)
2023	29	78.5	54.2
2022	9	82.5	55.3
2021	26	80.0	53.4
2020	21	82.2	53.0
2019	44	76.6	54.0
2018	63	77.6	49.6
2017	30	78.8	53.8
2016	50	76.6	52.0
2015	60	77.2	50.6
2014	20	81.9	53.5
2013	19	79.2	56.8
2012	13	83.9	52.8
2011	5	85.4	53.4
2010	45	77.5	52.8
2009	15	83.1	53.2
2008	40	80.0	51.0
2007	49	78.6	50.4
2006	43	79.7	51.1
2005	67	76.6	49.4
2004	64	75.6	51.4
2003	27	80.2	52.8
2002	55	77.6	50.7
2001	16	82.8	53.4
2000	80	71.9	50.2
1999	56	79.1	49.0
1998	6	82.7	55.8
1997	28	79.2	53.7
1996	75	74.2	49.3
1995	31	79.6	52.9
1994	24	81.4	53.4
1993	47	79.6	49.7
1992	72	75.1	49.6
1991	39	80.1	51.0
1990	1	88.0	57.9
1989	35	79.8	52.3
1988	53	78.1	50.3
1987	14	83.8	52.7
1986	89	69.8	49.0
1985	94	66.8	46.8
1984	76	74.5	48.4
1983	82	74.4	47.0
1982	59	76.9	50.9
1981	41	79.9	51.1
1980	57	77.0	51.0
1979	8	83.8	54.1
1978	74	72.7	51.0
1977	78	71.6	51.0
1976	7	83.3	54.6
1975	34	82.3	50.0
1974	32	82.2	50.2
1973	46	77.6	51.8
1972	86	73.1	47.6
1971	91	71.9	45.2
1970	93	70.4	45.9
1969	51	76.3	52.2
1968	68	74.5	51.2
1967	4	84.4	54.6
1966	11	82.6	54.6
1965	90	72.2	46.1
1964	83	73.9	47.5
1963	3	84.4	55.1
1962	54	78.6	49.7
1961	87	73.3	46.1
1960	58	79.6	48.3
1959	88	70.8	48.2
1958	71	75.6	49.1
1957	36	81.8	50.0
1956	69	78.1	47.5
1955	73	76.9	46.9
1954	79	75.7	46.4
1953	33	82.8	49.7
1952	37	81.6	49.7
1951	62	79.4	47.9
1950	52	79.8	48.8
1949	48	79.1	50.1
1948	70	77.4	47.6
1947	38	80.9	50.4
1946	65	78.6	48.3
1945	84	75.5	45.7
1944	10	87.3	50.2
1943	25	87.0	47.7
1942	42	83.2	47.8
1941	85	72.2	48.6
1940	12	80.7	56.3
1939	23	84.6	50.5
1938	2	89.9	55.7
1937	22	84.6	50.6
1936	66	80.0	46.3
1935	17	87.2	49.0
1934	77	78.3	44.4
1899	61	77.6	49.9
1898	18	80.8	55.4
1895	92	73.6	43.4
1894	81	75.8	45.7

Weather Station Details

Years	Station	Coordinates
1948–2024	Lewiston Nez Perce County Airport	location
1894–1947	Lewiston WTP	location