September weather in Joliet, MT
The average temperature in Joliet in September is 56.5°F (39.3°F–73.7°F). Average precipitation: 1.26 inches. Average snowfall is 0.4 inches.
September is a fall month in Joliet, and is warmer than the annual average of 43.7°F. Daily temperatures swing about 34.4°F between overnight low and afternoon high. Expect about 6 days with precipitation. Daylight averages about 12h 18m. For travel, September is a comfortable month to visit.
Avg High
73.7°F
Avg Low
39.3°F
Precipitation
1.26 in
Snow
0.4 in
September records in Joliet
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 99.0°F (1983) | 36.0°F (2020) | 1.25 in (1973) |
| September 2 | 96.1°F (1998) | 30.9°F (1974) | 0.94 in (1968) |
| September 3 | 96.1°F (2015) | 28.9°F (1961) | 1.05 in (1971) |
| September 4 | 98.1°F (1998) | 28.9°F (1962) | 0.37 in (2004) |
| September 5 | 98.1°F (2007) | 32.0°F (2011) | 0.35 in (2016) |
| September 6 | 100.9°F (2020) | 32.0°F (1996) | 0.33 in (1992) |
| September 7 | 95.0°F (1998) | 30.9°F (1992) | 0.60 in (1976) |
| September 8 | 97.0°F (1979) | 26.1°F (1960) | 1.33 in (1962) |
| September 9 | 93.9°F (1981) | 26.1°F (1962) | 0.86 in (2013) |
| September 10 | 93.0°F (1959) | 27.0°F (2020) | 0.87 in (1961) |
| September 11 | 95.0°F (1959) | 24.1°F (1989) | 0.83 in (1988) |
| September 12 | 95.0°F (1981) | 26.1°F (2014) | 0.95 in (2019) |
| September 13 | 90.0°F (1990) | 24.1°F (1961) | 1.26 in (1966) |
| September 14 | 90.0°F (2015) | 23.0°F (1961) | 1.37 in (1982) |
| September 15 | 97.0°F (2000) | 28.9°F (2007) | 1.50 in (2013) |
| September 16 | 95.0°F (1979) | 28.0°F (1965) | 1.33 in (2006) |
| September 17 | 93.0°F (1998) | 24.1°F (1965) | 0.96 in (1996) |
| September 18 | 91.9°F (1981) | 24.1°F (1971) | 2.79 in (1978) |
| September 19 | 90.0°F (1981) | 24.1°F (1965) | 1.51 in (1961) |
| September 20 | 91.0°F (2009) | 21.0°F (1983) | 0.66 in (1951) |
| September 21 | 86.0°F (1966) | 26.1°F (1983) | 1.20 in (2019) |
| September 22 | 88.0°F (1967) | 21.9°F (1961) | 1.42 in (2017) |
| September 23 | 89.1°F (1966) | 21.0°F (2000) | 0.58 in (2017) |
| September 24 | 89.1°F (1967) | 21.9°F (1961) | 0.32 in (1970) |
| September 25 | 91.9°F (2001) | 24.1°F (1984) | 0.25 in (1980) |
| September 26 | 93.9°F (1963) | 28.9°F (2017) | 0.36 in (2013) |
| September 27 | 93.0°F (2015) | 19.0°F (1961) | 0.80 in (1974) |
| September 28 | 89.1°F (1967) | 18.0°F (1984) | 0.55 in (1983) |
| September 29 | 91.0°F (2001) | 18.0°F (1985) | 0.25 in (2019) |
| September 30 | 89.1°F (1963) | 18.0°F (1985) | 0.45 in (1971) |