September weather in Hardin, MT
The average temperature in Hardin in September is 61.6°F (44.1°F–79.1°F). Average precipitation: 1.36 inches.
September is a fall month in Hardin, and is warmer than the annual average of 47.7°F. Daily temperatures swing about 35°F between overnight low and afternoon high. Expect about 5 days with precipitation. Daylight averages about 12h 18m. For travel, September is a comfortable month to visit.
Avg High
79.1°F
Avg Low
44.1°F
Precipitation
1.36 in
Daylight
12h 18m
September records in Hardin
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 102.9°F (1983) | 34.0°F (1952) | 1.06 in (1973) |
| September 2 | 102.9°F (1983) | 32.0°F (1952) | 0.58 in (1953) |
| September 3 | 102.9°F (2022) | 32.0°F (1952) | 0.60 in (1949) |
| September 4 | 104.0°F (1950) | 28.0°F (1962) | 0.66 in (2016) |
| September 5 | 102.9°F (2020) | 32.0°F (1952) | 0.65 in (1987) |
| September 6 | 104.0°F (1976) | 33.1°F (1956) | 0.57 in (2001) |
| September 7 | 105.1°F (2022) | 34.0°F (1965) | 0.53 in (2013) |
| September 8 | 99.0°F (1998) | 32.0°F (1962) | 0.90 in (1962) |
| September 9 | 98.1°F (1994) | 27.0°F (1962) | 0.43 in (1962) |
| September 10 | 95.0°F (2017) | 28.0°F (1962) | 1.30 in (1961) |
| September 11 | 97.0°F (1954) | 21.9°F (1989) | 3.10 in (1991) |
| September 12 | 97.0°F (1959) | 23.0°F (1989) | 1.35 in (1978) |
| September 13 | 93.0°F (1948) | 26.1°F (1989) | 1.75 in (1966) |
| September 14 | 102.0°F (1948) | 28.0°F (1992) | 1.31 in (2013) |
| September 15 | 99.0°F (2000) | 28.0°F (1952) | 1.41 in (2017) |
| September 16 | 98.1°F (2000) | 28.0°F (1970) | 0.64 in (2006) |
| September 17 | 93.9°F (1984) | 25.0°F (1965) | 0.55 in (1959) |
| September 18 | 98.1°F (1984) | 24.1°F (1965) | 1.30 in (2024) |
| September 19 | 95.0°F (2009) | 23.0°F (1965) | 1.22 in (1978) |
| September 20 | 97.0°F (1984) | 23.0°F (1965) | 0.80 in (2004) |
| September 21 | 89.1°F (2025) | 28.0°F (1953) | 1.20 in (1994) |
| September 22 | 91.9°F (2007) | 28.0°F (1952) | 0.86 in (2023) |
| September 23 | 93.9°F (1992) | 27.0°F (1955) | 0.45 in (2006) |
| September 24 | 93.9°F (1992) | 15.1°F (1984) | 1.45 in (2016) |
| September 25 | 97.0°F (2015) | 21.0°F (1984) | 0.59 in (2013) |
| September 26 | 95.0°F (2010) | 25.0°F (1972) | 0.57 in (2013) |
| September 27 | 93.9°F (2001) | 21.9°F (1964) | 0.86 in (1974) |
| September 28 | 95.0°F (2001) | 3.9°F (1997) | 0.31 in (1986) |
| September 29 | 98.1°F (2024) | 24.1°F (1984) | 0.59 in (2019) |
| September 30 | 95.0°F (1989) | 21.9°F (1985) | 0.81 in (1950) |