September weather in St. Joseph, MI
The average temperature in St. Joseph in September is 64.5°F (53.6°F–75.5°F). Average precipitation: 3.40 inches.
September is a fall month in St. Joseph, and is warmer than the annual average of 50.1°F. Daily temperatures swing about 21.9°F between overnight low and afternoon high. Expect about 9 days with precipitation. Daylight averages about 12h 16m. For travel, September is one of the best months of the year to visit.
Avg High
75.5°F
Avg Low
53.6°F
Precipitation
3.40 in
Daylight
12h 16m
September records in St. Joseph
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 98.1°F (1953) | 39.9°F (1895) | 2.75 in (1968) |
| September 2 | 98.1°F (1953) | 41.0°F (1893) | 0.72 in (2018) |
| September 3 | 98.1°F (2011) | 37.0°F (1946) | 1.53 in (1941) |
| September 4 | 91.9°F (2018) | 37.0°F (1997) | 0.78 in (1988) |
| September 5 | 91.9°F (1959) | 39.9°F (1984) | 2.42 in (2008) |
| September 6 | 96.1°F (1954) | 37.0°F (1962) | 1.08 in (1969) |
| September 7 | 96.1°F (1960) | 36.0°F (1988) | 1.37 in (2017) |
| September 8 | 96.1°F (2002) | 34.0°F (1951) | 2.75 in (2021) |
| September 9 | 98.1°F (2002) | 39.9°F (1944) | 1.58 in (1942) |
| September 10 | 95.0°F (2013) | 39.0°F (1988) | 2.06 in (1994) |
| September 11 | 93.9°F (2005) | 34.0°F (1943) | 1.27 in (1984) |
| September 12 | 93.0°F (1897) | 33.1°F (1964) | 2.02 in (1978) |
| September 13 | 95.0°F (2005) | 32.0°F (1985) | 2.20 in (2008) |
| September 14 | 91.9°F (1962) | 33.1°F (1985) | 2.25 in (2008) |
| September 15 | 96.1°F (2013) | 34.0°F (1966) | 1.22 in (1965) |
| September 16 | 95.0°F (1897) | 35.1°F (1986) | 0.79 in (2005) |
| September 17 | 91.0°F (1955) | 32.0°F (1990) | 1.85 in (1997) |
| September 18 | 90.0°F (1955) | 35.1°F (1943) | 1.88 in (1972) |
| September 19 | 89.1°F (2007) | 34.0°F (2020) | 1.70 in (1950) |
| September 20 | 93.0°F (2018) | 36.0°F (1896) | 1.55 in (1983) |
| September 21 | 93.9°F (2018) | 30.0°F (1991) | 1.62 in (1982) |
| September 22 | 91.9°F (2005) | 34.0°F (1999) | 1.26 in (1893) |
| September 23 | 93.0°F (2010) | 30.0°F (1896) | 1.90 in (1984) |
| September 24 | 93.0°F (2007) | 28.0°F (1989) | 1.31 in (1977) |
| September 25 | 91.0°F (2007) | 28.9°F (1989) | 1.60 in (1961) |
| September 26 | 91.9°F (1998) | 28.0°F (1947) | 1.60 in (1986) |
| September 27 | 89.1°F (2017) | 23.0°F (1989) | 1.40 in (1964) |
| September 28 | 86.0°F (1952) | 24.1°F (1991) | 1.15 in (2019) |
| September 29 | 96.1°F (1953) | 28.9°F (1991) | 1.53 in (1954) |
| September 30 | 93.0°F (1953) | 27.0°F (1984) | 1.75 in (1986) |