September weather in Evanston, WY
The average temperature in Evanston in September is 54.7°F (38.6°F–70.7°F). Average precipitation: 1.17 inches.
September is a fall month in Evanston, and is warmer than the annual average of 42°F. Daily temperatures swing about 32.1°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
70.7°F
Avg Low
38.6°F
Precipitation
1.17 in
Daylight
12h 16m
September records in Evanston
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 90.0°F (1985) | 27.0°F (1926) | 1.20 in (2008) |
| September 2 | 90.0°F (1985) | 28.0°F (1952) | 0.74 in (1937) |
| September 3 | 90.0°F (1985) | 25.0°F (1961) | 0.91 in (1915) |
| September 4 | 91.0°F (2022) | 25.0°F (1953) | 0.67 in (2023) |
| September 5 | 90.0°F (1985) | 25.0°F (1956) | 0.73 in (1970) |
| September 6 | 93.0°F (2022) | 23.0°F (1956) | 0.62 in (1965) |
| September 7 | 93.0°F (2022) | 24.1°F (1956) | 0.75 in (1971) |
| September 8 | 87.1°F (2021) | 24.1°F (1957) | 0.80 in (2013) |
| September 9 | 89.1°F (2021) | 18.0°F (1903) | 0.60 in (2014) |
| September 10 | 86.0°F (2021) | 21.0°F (1962) | 0.38 in (1924) |
| September 11 | 88.0°F (1968) | 21.9°F (1916) | 1.21 in (1915) |
| September 12 | 89.1°F (1985) | 18.0°F (1951) | 0.60 in (2013) |
| September 13 | 88.0°F (1990) | 19.9°F (1949) | 0.46 in (1982) |
| September 14 | 87.1°F (1990) | 24.1°F (1914) | 0.55 in (2016) |
| September 15 | 86.0°F (1954) | 18.0°F (1970) | 0.79 in (2006) |
| September 16 | 81.0°F (1920) | 17.1°F (1936) | 0.55 in (1996) |
| September 17 | 84.0°F (1898) | 19.0°F (1902) | 0.70 in (2011) |
| September 18 | 84.9°F (1898) | 10.0°F (1965) | 0.80 in (1995) |
| September 19 | 86.0°F (1898) | 14.0°F (1978) | 0.80 in (1990) |
| September 20 | 82.9°F (1956) | 18.0°F (1978) | 0.63 in (1989) |
| September 21 | 81.0°F (1905) | 16.0°F (1912) | 0.50 in (1902) |
| September 22 | 84.9°F (1905) | 14.0°F (1956) | 0.62 in (2000) |
| September 23 | 82.9°F (1966) | 17.1°F (1956) | 1.00 in (1900) |
| September 24 | 82.0°F (1987) | 3.0°F (2009) | 1.38 in (1908) |
| September 25 | 86.0°F (2014) | 5.0°F (1926) | 0.62 in (1915) |
| September 26 | 82.0°F (2024) | 19.9°F (1970) | 1.24 in (1982) |
| September 27 | 84.0°F (1963) | 14.0°F (1924) | 0.86 in (1923) |
| September 28 | 82.9°F (1963) | 16.0°F (1950) | 2.10 in (2014) |
| September 29 | 81.0°F (2024) | 16.0°F (1985) | 0.61 in (1905) |
| September 30 | 81.0°F (2015) | 14.0°F (1954) | 1.30 in (2009) |