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Lewiston September Precipitation Totals

A time series of total precipitation in the month of September in Lewiston, Idaho from 1894–2023.

Rainiest September in Lewiston History

The rainiest September in Lewiston, Idaho history happened in 1940, with 4.42 inches of total precipitation.

Driest September in Lewiston History

There have been 3 times where no rain was recorded in Lewiston, Idaho for the entire month of September. The most recent time this happened was 2012.

Lewiston Average September Precipitation by Year

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Year	Precipitation (inches)
2023	1.04
2022	1.38
2021	0.69
2020	0.28
2019	1.05
2018	0.04
2017	0.56
2016	0.55
2015	0.65
2014	0.25
2013	1.57
2012	0.00
2011	0.14
2010	0.70
2009	0.09
2008	0.75
2007	0.10
2006	0.66
2005	0.17
2004	0.33
2003	1.06
2002	0.38
2001	0.19
2000	2.48
1999	0.00
1998	1.90
1997	0.98
1996	0.47
1995	1.21
1994	0.37
1993	0.07
1992	0.84
1991	0.24
1990	0.04
1989	0.64
1988	0.82
1987	0.01
1986	0.94
1985	1.82
1984	0.21
1983	0.74
1982	0.97
1981	1.01
1980	0.97
1979	0.18
1978	1.06
1977	2.22
1976	0.33
1975	0.00
1974	0.10
1973	1.12
1972	0.83
1971	1.57
1970	1.29
1969	1.38
1968	1.27
1967	0.60
1966	0.22
1965	0.28
1964	0.87
1963	0.52
1962	0.83
1961	0.51
1960	0.69
1959	1.93
1958	0.37
1957	0.12
1956	0.23
1955	1.96
1954	1.01
1953	0.04
1952	0.64
1951	0.34
1950	0.49
1949	1.31
1948	0.49
1947	2.62
1946	2.21
1945	1.91
1944	0.49
1943	0.50
1942	0.38
1941	1.28
1940	4.42
1939	0.15
1938	0.71
1937	0.33
1936	0.71
1935	0.24
1934	0.28
1899	0.71
1898	0.35
1895	1.39
1894	1.03

Its possible for precipitation totals to include both rain and melted snowfall
Months with more than 10% missing data are excluded