Lewiston September Weather

Averages and records for weather in Lewiston, Idaho in the month of September.
Typical Lewiston September Weather
1991–2020
Average daily high 79.1 °F
Average daily low 52.0 °F
Average monthly precipitation 0.6 inches
Average monthly snow none
Lewiston September Weather Records
1894–2023
Highest temperature 108 °F September 7, 1944
Lowest temperature 28 °F September 17, 1965
Highest daily low 70 °F September 2, 2013
Lowest daily high 45 °F September 24, 1934
Hottest average temperature 7.7 °F
above average
1990
Coldest average temperature -8.4 °F
below average
1985
Most daily precipitation 1.7 inches September 14, 1955
Most monthly precipitation 4.4 inches 1940
Most daily snow none -
Most monthly snow none -
Note: Daily averages are a moving average which includes 14 days before and after
Day Average (°F) Record (°F)
High Low High Low
September 1 84.7 56.1 102 44
September 2 84.2 55.8 103 43
September 3 83.7 55.5 105 39
September 4 83.3 55.2 103 39
September 5 82.8 55.0 101 40
September 6 82.4 54.6 103 36
September 7 82.0 54.3 108 38
September 8 81.7 54.0 106 37
September 9 81.4 53.8 102 40
September 10 81.0 53.5 103 33
September 11 80.6 53.3 102 36
September 12 80.2 53.0 103 36
September 13 79.9 52.7 98 33
September 14 79.6 52.3 99 32
September 15 79.3 52.1 100 35
September 16 78.9 51.9 101 35
September 17 78.6 51.6 99 28
September 18 78.1 51.3 101 35
September 19 77.5 50.9 101 30
September 20 77.0 50.5 95 34
September 21 76.5 50.2 102 29
September 22 76.0 49.8 99 34
September 23 75.6 49.6 97 31
September 24 75.2 49.3 100 34
September 25 74.6 49.0 94 30
September 26 74.0 48.6 95 30
September 27 73.3 48.2 93 35
September 28 72.7 47.8 95 33
September 29 72.2 47.5 88 31
September 30 71.7 47.1 89 30
Weather Station Details
Years Station Coordinates
1948–2023 Lewiston Nez Perce County Airport location
1894–1947 Lewiston WTP location