September weather in Lewiston, UT
The average temperature in Lewiston in September is 58.5°F (39.8°F–77.2°F). Average precipitation: 1.26 inches.
September is a fall month in Lewiston, and is warmer than the annual average of 45.9°F. Daily temperatures swing about 37.4°F between overnight low and afternoon high. Expect about 5 days with precipitation. Daylight averages about 12h 16m. For travel, September is a comfortable month to visit.
Avg High
77.2°F
Avg Low
39.8°F
Precipitation
1.26 in
Daylight
12h 16m
September records in Lewiston
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 96.1°F (1948) | 34.0°F (1981) | 0.29 in (2000) |
| September 2 | 95.0°F (1978) | 25.0°F (2015) | 0.65 in (1985) |
| September 3 | 95.0°F (1948) | 36.0°F (1984) | 0.37 in (1983) |
| September 4 | 97.0°F (2022) | 32.0°F (1989) | 0.45 in (1999) |
| September 5 | 97.0°F (2022) | 36.0°F (1987) | 0.27 in (1992) |
| September 6 | 98.1°F (2022) | 28.9°F (1996) | 0.58 in (1945) |
| September 7 | 99.0°F (2022) | 32.0°F (1996) | 0.75 in (2002) |
| September 8 | 99.0°F (2022) | 28.9°F (1976) | 0.98 in (2002) |
| September 9 | 91.9°F (1948) | 28.9°F (2020) | 0.70 in (2019) |
| September 10 | 96.1°F (1948) | 28.0°F (2020) | 0.34 in (1982) |
| September 11 | 95.0°F (1948) | 28.0°F (1989) | 0.52 in (2019) |
| September 12 | 90.0°F (1948) | 28.9°F (2014) | 0.63 in (1985) |
| September 13 | 90.0°F (2017) | 28.9°F (1989) | 0.24 in (2016) |
| September 14 | 87.1°F (1995) | 23.0°F (1993) | 0.19 in (1988) |
| September 15 | 91.0°F (2000) | 24.1°F (1993) | 0.24 in (2009) |
| September 16 | 91.9°F (2000) | 30.0°F (1993) | 0.91 in (2015) |
| September 17 | 91.9°F (2000) | 28.0°F (1987) | 1.37 in (1947) |
| September 18 | 90.0°F (1979) | 26.1°F (1987) | 0.95 in (1978) |
| September 19 | 87.1°F (1984) | 26.1°F (1988) | 0.56 in (2017) |
| September 20 | 89.1°F (2010) | 23.0°F (1983) | 0.81 in (1999) |
| September 21 | 86.0°F (1987) | 21.9°F (1983) | 0.94 in (1945) |
| September 22 | 88.0°F (1987) | 21.9°F (1983) | 0.68 in (2023) |
| September 23 | 88.0°F (1987) | 27.0°F (1985) | 2.01 in (1984) |
| September 24 | 90.0°F (2001) | 28.0°F (2000) | 1.10 in (2016) |
| September 25 | 89.1°F (2001) | 26.1°F (1995) | 0.36 in (1981) |
| September 26 | 97.0°F (2018) | 26.1°F (1992) | 2.38 in (1982) |
| September 27 | 87.1°F (2001) | 25.0°F (1992) | 1.15 in (2014) |
| September 28 | 86.0°F (2001) | 23.0°F (1999) | 0.47 in (2019) |
| September 29 | 90.0°F (2024) | 19.0°F (1985) | 2.55 in (2019) |
| September 30 | 91.0°F (2024) | 19.9°F (1985) | 0.84 in (1983) |