September weather in Ennis, MT
The average temperature in Ennis in September is 54.6°F (37.1°F–72.2°F). Average precipitation: 0.97 inches.
September is a fall month in Ennis, and is warmer than the annual average of 42.7°F. Daily temperatures swing about 35.1°F between overnight low and afternoon high. Expect about 7 days with precipitation. Daylight averages about 12h 18m. For travel, September is cool.
Avg High
72.2°F
Avg Low
37.1°F
Precipitation
0.97 in
Snow
0.1 in
September records in Ennis
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 91.9°F (1967) | 21.9°F (1930) | 0.73 in (1973) |
| September 2 | 93.9°F (2024) | 24.1°F (2006) | 0.63 in (1985) |
| September 3 | 91.9°F (2007) | 28.0°F (2006) | 0.70 in (1990) |
| September 4 | 98.1°F (2022) | 26.1°F (1929) | 0.69 in (2023) |
| September 5 | 93.9°F (1967) | 27.0°F (2014) | 0.50 in (1930) |
| September 6 | 96.1°F (2020) | 27.0°F (2014) | 0.72 in (2002) |
| September 7 | 95.0°F (2022) | 21.0°F (1929) | 0.90 in (2019) |
| September 8 | 97.0°F (2022) | 21.9°F (1929) | 1.00 in (1925) |
| September 9 | 93.0°F (2021) | 21.9°F (2020) | 1.34 in (1950) |
| September 10 | 89.1°F (1966) | 26.1°F (1921) | 0.60 in (1921) |
| September 11 | 88.0°F (1981) | 21.9°F (1989) | 0.65 in (1978) |
| September 12 | 90.0°F (1953) | 19.9°F (2014) | 0.94 in (1956) |
| September 13 | 89.1°F (1948) | 21.9°F (1974) | 0.60 in (1991) |
| September 14 | 88.0°F (1948) | 25.0°F (1961) | 0.50 in (1939) |
| September 15 | 93.0°F (2000) | 21.9°F (1970) | 0.80 in (1966) |
| September 16 | 90.0°F (2000) | 21.9°F (1936) | 1.14 in (2015) |
| September 17 | 89.1°F (1981) | 19.9°F (1965) | 0.68 in (1947) |
| September 18 | 88.0°F (1981) | 17.1°F (1965) | 0.98 in (1976) |
| September 19 | 89.1°F (1922) | 18.0°F (1965) | 0.90 in (1925) |
| September 20 | 89.1°F (1922) | 12.0°F (1983) | 0.76 in (1931) |
| September 21 | 89.1°F (1922) | 21.0°F (1995) | 1.33 in (1959) |
| September 22 | 86.0°F (1966) | 19.0°F (1971) | 0.90 in (2022) |
| September 23 | 89.1°F (1987) | 16.0°F (1934) | 0.82 in (1941) |
| September 24 | 89.1°F (2001) | 12.0°F (1926) | 0.91 in (1958) |
| September 25 | 88.0°F (1994) | 12.0°F (1926) | 0.80 in (1924) |
| September 26 | 88.0°F (2015) | 15.1°F (1926) | 0.79 in (1982) |
| September 27 | 87.1°F (2010) | 15.1°F (1935) | 1.05 in (2014) |
| September 28 | 86.0°F (2010) | 18.0°F (1945) | 0.57 in (1983) |
| September 29 | 87.1°F (2024) | 10.0°F (1985) | 0.80 in (1925) |
| September 30 | 88.0°F (2024) | 12.0°F (1985) | 1.21 in (1977) |