September weather in Green River, WY
The average temperature in Green River in September is 58.3°F (40.9°F–75.7°F). Average precipitation: 0.87 inches. Average snowfall is 0.3 inches.
September is a fall month in Green River, and is warmer than the annual average of 44.1°F. Daily temperatures swing about 34.8°F between overnight low and afternoon high. Expect about 6 days with precipitation. Daylight averages about 12h 16m. For travel, September is a comfortable month to visit.
Avg High
75.7°F
Avg Low
40.9°F
Precipitation
0.87 in
Snow
0.3 in
September records in Green River
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 93.0°F (2013) | 25.0°F (1908) | 1.54 in (2008) |
| September 2 | 95.0°F (1950) | 28.9°F (1908) | 0.32 in (1921) |
| September 3 | 96.1°F (1950) | 28.0°F (1961) | 1.25 in (1938) |
| September 4 | 96.1°F (2022) | 30.0°F (1989) | 0.56 in (1983) |
| September 5 | 97.0°F (2022) | 28.0°F (1910) | 0.73 in (2007) |
| September 6 | 98.1°F (1998) | 28.0°F (1911) | 0.67 in (1981) |
| September 7 | 95.0°F (2022) | 26.1°F (1911) | 0.58 in (1971) |
| September 8 | 98.1°F (2022) | 25.0°F (1911) | 0.50 in (2020) |
| September 9 | 90.0°F (1931) | 25.0°F (1962) | 0.90 in (1986) |
| September 10 | 93.0°F (2021) | 26.1°F (1962) | 0.40 in (2014) |
| September 11 | 90.0°F (1953) | 23.0°F (1916) | 1.50 in (1973) |
| September 12 | 91.0°F (1919) | 28.0°F (1906) | 0.53 in (1985) |
| September 13 | 93.9°F (1990) | 23.0°F (1967) | 0.41 in (2004) |
| September 14 | 91.0°F (1990) | 21.9°F (1993) | 0.55 in (1912) |
| September 15 | 91.9°F (1990) | 19.0°F (1970) | 0.45 in (1966) |
| September 16 | 89.1°F (2018) | 24.1°F (1912) | 0.50 in (1965) |
| September 17 | 90.0°F (1914) | 21.0°F (1965) | 1.20 in (1923) |
| September 18 | 90.0°F (1998) | 3.9°F (1965) | 0.45 in (1990) |
| September 19 | 90.0°F (2010) | 10.9°F (1965) | 0.57 in (2004) |
| September 20 | 91.9°F (2010) | 18.0°F (1912) | 0.72 in (1950) |
| September 21 | 89.1°F (1930) | 19.0°F (1921) | 0.61 in (1925) |
| September 22 | 90.0°F (1905) | 18.0°F (1912) | 0.31 in (1929) |
| September 23 | 89.1°F (1918) | 18.0°F (1912) | 0.86 in (2007) |
| September 24 | 87.1°F (1987) | 19.9°F (1921) | 0.95 in (1923) |
| September 25 | 90.0°F (2001) | 10.0°F (1926) | 0.40 in (2017) |
| September 26 | 90.0°F (2015) | 12.0°F (1926) | 0.75 in (1915) |
| September 27 | 90.0°F (2001) | 18.0°F (1908) | 0.73 in (1982) |
| September 28 | 89.1°F (2010) | 17.1°F (1921) | 0.75 in (2014) |
| September 29 | 91.0°F (2010) | 12.9°F (1985) | 0.80 in (1905) |
| September 30 | 88.0°F (2010) | 9.0°F (1985) | 0.60 in (1926) |