September weather in Lyman, WY
The average temperature in Lyman in September is 53.6°F (37.2°F–70.0°F). Average precipitation: 1.28 inches. Average snowfall is 1.0 inches.
September is a fall month in Lyman, and is warmer than the annual average of 40.8°F. Daily temperatures swing about 32.8°F between overnight low and afternoon high. Expect about 7 days with precipitation. Daylight averages about 12h 16m. For travel, September is cool.
Avg High
70.0°F
Avg Low
37.2°F
Precipitation
1.28 in
Snow
1.0 in
September records in Lyman
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 86.0°F (1995) | 32.0°F (2020) | 0.93 in (2008) |
| September 2 | 86.0°F (1995) | 28.0°F (1974) | 0.73 in (1999) |
| September 3 | 90.0°F (2017) | 28.9°F (1974) | 1.14 in (1983) |
| September 4 | 93.0°F (2017) | 32.0°F (1968) | 0.42 in (1987) |
| September 5 | 89.1°F (2017) | 33.1°F (1987) | 1.08 in (2007) |
| September 6 | 87.1°F (1978) | 30.0°F (2010) | 0.55 in (1984) |
| September 7 | 87.1°F (1979) | 25.0°F (1968) | 0.62 in (1971) |
| September 8 | 89.1°F (2022) | 26.1°F (2020) | 0.57 in (2006) |
| September 9 | 84.9°F (1979) | 23.0°F (2020) | 0.50 in (2020) |
| September 10 | 84.0°F (2021) | 18.0°F (2020) | 0.50 in (2006) |
| September 11 | 84.9°F (1990) | 26.1°F (2010) | 3.33 in (2013) |
| September 12 | 87.1°F (1990) | 21.9°F (2014) | 0.58 in (2013) |
| September 13 | 84.9°F (1990) | 21.0°F (1974) | 0.41 in (1982) |
| September 14 | 84.9°F (1990) | 24.1°F (1974) | 0.46 in (1988) |
| September 15 | 84.9°F (2000) | 19.0°F (1970) | 0.54 in (2013) |
| September 16 | 82.9°F (2000) | 21.9°F (1971) | 0.33 in (1996) |
| September 17 | 82.9°F (2018) | 24.1°F (1971) | 0.60 in (2011) |
| September 18 | 82.0°F (2014) | 16.0°F (1971) | 0.38 in (1978) |
| September 19 | 82.9°F (2010) | 17.1°F (1978) | 0.80 in (1989) |
| September 20 | 80.1°F (2010) | 18.0°F (1983) | 0.46 in (1989) |
| September 21 | 80.1°F (1966) | 19.9°F (1978) | 0.48 in (1990) |
| September 22 | 79.0°F (1966) | 19.9°F (1984) | 1.25 in (2000) |
| September 23 | 84.0°F (1966) | 21.0°F (2000) | 1.05 in (2000) |
| September 24 | 81.0°F (2001) | 23.0°F (2000) | 0.47 in (1984) |
| September 25 | 82.0°F (2001) | 18.0°F (1970) | 0.23 in (2017) |
| September 26 | 81.0°F (2010) | 19.0°F (1984) | 0.52 in (2013) |
| September 27 | 82.0°F (2010) | 17.1°F (1996) | 0.78 in (1982) |
| September 28 | 82.0°F (2010) | 15.1°F (1971) | 0.49 in (2014) |
| September 29 | 81.0°F (2010) | 9.0°F (1985) | 0.14 in (2014) |
| September 30 | 81.0°F (2024) | 18.0°F (1985) | 0.81 in (1994) |