September weather in Newcastle, WY
The average temperature in Newcastle in September is 62.0°F (49.0°F–75.1°F). Average precipitation: 1.20 inches. Average snowfall is 0.2 inches.
September is a fall month in Newcastle, and is warmer than the annual average of 47.3°F. Daily temperatures swing about 26.1°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
75.1°F
Avg Low
49.0°F
Precipitation
1.20 in
Snow
0.2 in
September records in Newcastle
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 100.9°F (1940) | 36.0°F (1930) | 1.05 in (1914) |
| September 2 | 97.0°F (1940) | 32.0°F (1952) | 1.00 in (1973) |
| September 3 | 97.0°F (2024) | 36.0°F (1934) | 1.35 in (2021) |
| September 4 | 98.1°F (2007) | 34.0°F (1935) | 0.80 in (1915) |
| September 5 | 100.0°F (1998) | 33.1°F (1968) | 0.40 in (1995) |
| September 6 | 100.0°F (2022) | 30.9°F (1929) | 0.80 in (1986) |
| September 7 | 100.0°F (1908) | 30.9°F (1929) | 1.08 in (1960) |
| September 8 | 98.1°F (1931) | 24.1°F (2020) | 1.14 in (1946) |
| September 9 | 100.0°F (2022) | 30.0°F (1962) | 2.00 in (2002) |
| September 10 | 97.0°F (1931) | 34.0°F (1929) | 1.31 in (1912) |
| September 11 | 97.0°F (1998) | 26.1°F (1989) | 0.79 in (1973) |
| September 12 | 93.9°F (1908) | 30.0°F (1961) | 0.90 in (1991) |
| September 13 | 93.9°F (1911) | 28.9°F (1949) | 1.20 in (1967) |
| September 14 | 95.0°F (1908) | 24.1°F (1993) | 0.64 in (1967) |
| September 15 | 93.9°F (1948) | 27.0°F (1934) | 0.66 in (2011) |
| September 16 | 93.9°F (1908) | 26.1°F (1965) | 0.79 in (1945) |
| September 17 | 97.0°F (2000) | 26.1°F (1965) | 0.80 in (1908) |
| September 18 | 97.0°F (2000) | 25.0°F (1971) | 0.70 in (1945) |
| September 19 | 93.9°F (1998) | 28.0°F (1942) | 0.52 in (1993) |
| September 20 | 96.1°F (1937) | 24.1°F (1983) | 1.04 in (1989) |
| September 21 | 91.9°F (1938) | 18.0°F (1983) | 0.80 in (1998) |
| September 22 | 88.0°F (1908) | 25.0°F (1995) | 0.45 in (1963) |
| September 23 | 91.9°F (1938) | 21.9°F (1985) | 1.48 in (1997) |
| September 24 | 91.9°F (1992) | 19.9°F (1985) | 1.05 in (1959) |
| September 25 | 90.0°F (1992) | 12.0°F (1926) | 1.22 in (1930) |
| September 26 | 91.0°F (2024) | 17.1°F (1942) | 2.12 in (1915) |
| September 27 | 95.0°F (2024) | 23.0°F (1951) | 0.49 in (1984) |
| September 28 | 91.9°F (2021) | 23.0°F (1984) | 0.43 in (2004) |
| September 29 | 93.9°F (2024) | 19.9°F (1961) | 2.60 in (1923) |
| September 30 | 96.1°F (2024) | 21.0°F (1985) | 1.03 in (1918) |