September weather in Gillette, WY
The average temperature in Gillette in September is 60.8°F (46.4°F–75.3°F). Average precipitation: 1.25 inches. Average snowfall is 0.5 inches.
September is a fall month in Gillette, and is warmer than the annual average of 46.8°F. Daily temperatures swing about 28.9°F between overnight low and afternoon high. Expect about 6 days with precipitation. Daylight averages about 12h 17m. For travel, September is a comfortable month to visit.
Avg High
75.3°F
Avg Low
46.4°F
Precipitation
1.25 in
Snow
0.5 in
September records in Gillette
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 98.1°F (1983) | 30.0°F (1930) | 1.20 in (1986) |
| September 2 | 98.1°F (2024) | 34.0°F (1974) | 1.41 in (1973) |
| September 3 | 98.1°F (1978) | 30.9°F (1961) | 1.65 in (1951) |
| September 4 | 98.1°F (1978) | 25.0°F (1962) | 0.79 in (1915) |
| September 5 | 102.0°F (1978) | 30.0°F (1912) | 0.75 in (1993) |
| September 6 | 102.0°F (1978) | 30.9°F (1929) | 0.87 in (1946) |
| September 7 | 99.0°F (1908) | 28.0°F (1929) | 1.05 in (1945) |
| September 8 | 99.0°F (1979) | 26.1°F (1962) | 0.65 in (2020) |
| September 9 | 98.1°F (1979) | 28.0°F (2020) | 1.50 in (2022) |
| September 10 | 97.0°F (2021) | 28.9°F (1989) | 1.12 in (2003) |
| September 11 | 98.1°F (1921) | 21.0°F (1921) | 0.67 in (1951) |
| September 12 | 96.1°F (1922) | 23.0°F (1949) | 0.67 in (1909) |
| September 13 | 91.9°F (1971) | 25.0°F (1970) | 2.05 in (1998) |
| September 14 | 98.1°F (1948) | 24.1°F (1993) | 1.46 in (1982) |
| September 15 | 91.0°F (2009) | 27.0°F (1912) | 1.24 in (1994) |
| September 16 | 95.0°F (1908) | 25.0°F (1965) | 0.71 in (1980) |
| September 17 | 98.1°F (1920) | 23.0°F (1965) | 0.80 in (1945) |
| September 18 | 99.0°F (1920) | 19.9°F (1912) | 0.71 in (1947) |
| September 19 | 100.0°F (1920) | 25.0°F (1965) | 0.56 in (1990) |
| September 20 | 97.0°F (1920) | 24.1°F (1983) | 0.85 in (1989) |
| September 21 | 93.0°F (1922) | 19.0°F (1995) | 1.02 in (1977) |
| September 22 | 91.9°F (1958) | 25.0°F (1971) | 1.10 in (2006) |
| September 23 | 91.0°F (1905) | 24.1°F (1926) | 0.73 in (1977) |
| September 24 | 91.9°F (2020) | 14.0°F (1926) | 1.61 in (2016) |
| September 25 | 93.9°F (2024) | 10.0°F (1926) | 0.82 in (1986) |
| September 26 | 93.9°F (2024) | 14.0°F (1942) | 1.24 in (1915) |
| September 27 | 93.0°F (2015) | 21.9°F (1964) | 0.97 in (1982) |
| September 28 | 90.0°F (2010) | 19.9°F (1985) | 2.12 in (1923) |
| September 29 | 93.9°F (2024) | 19.0°F (1985) | 0.66 in (1995) |
| September 30 | 93.9°F (2024) | 21.0°F (1961) | 1.25 in (1905) |