September weather in Bay City, MI
The average temperature in Bay City in September is 62.7°F (51.6°F–73.7°F). Average precipitation: 3.21 inches.
September is a fall month in Bay City, and is warmer than the annual average of 47.8°F. Daily temperatures swing about 22.1°F between overnight low and afternoon high. Expect about 8 days with precipitation. Daylight averages about 12h 17m. For travel, September is one of the best months of the year to visit.
Avg High
73.7°F
Avg Low
51.6°F
Precipitation
3.21 in
Daylight
12h 17m
September records in Bay City
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 87.1°F (2000) | 46.0°F (2001) | 0.30 in (1980) |
| September 2 | 91.0°F (2000) | 46.0°F (1994) | 1.63 in (1984) |
| September 3 | 89.1°F (1999) | 46.9°F (1987) | 0.84 in (1988) |
| September 4 | 87.1°F (1983) | 42.1°F (1997) | 1.90 in (1981) |
| September 5 | 89.1°F (1999) | 43.0°F (1984) | 1.97 in (1988) |
| September 6 | 91.9°F (1998) | 42.1°F (1988) | 2.14 in (1985) |
| September 7 | 88.0°F (2007) | 39.0°F (1986) | 1.32 in (1990) |
| September 8 | 90.0°F (2001) | 39.9°F (1979) | 1.53 in (2005) |
| September 9 | 90.0°F (2002) | 44.1°F (1979) | 1.49 in (1989) |
| September 10 | 90.0°F (1983) | 42.1°F (1993) | 1.95 in (1986) |
| September 11 | 91.9°F (1983) | 44.1°F (1995) | 7.72 in (1986) |
| September 12 | 90.0°F (2005) | 46.0°F (1985) | 1.20 in (2006) |
| September 13 | 90.0°F (2005) | 45.0°F (1985) | 1.68 in (1980) |
| September 14 | 91.0°F (2005) | 43.0°F (1986) | 1.34 in (1993) |
| September 15 | 87.1°F (1994) | 37.9°F (2007) | 1.70 in (2008) |
| September 16 | 88.0°F (1991) | 36.0°F (2007) | 1.40 in (1995) |
| September 17 | 82.9°F (2002) | 37.9°F (1986) | 2.99 in (1981) |
| September 18 | 86.0°F (2003) | 37.0°F (1990) | 1.70 in (1983) |
| September 19 | 84.0°F (1998) | 39.9°F (1979) | 1.47 in (1985) |
| September 20 | 89.1°F (1998) | 37.9°F (1997) | 1.07 in (1988) |
| September 21 | 89.1°F (1998) | 37.9°F (1991) | 1.46 in (1983) |
| September 22 | 88.0°F (2005) | 35.1°F (1995) | 1.30 in (1986) |
| September 23 | 84.9°F (1984) | 37.0°F (1989) | 1.24 in (2000) |
| September 24 | 87.1°F (2004) | 34.0°F (1989) | 1.45 in (2001) |
| September 25 | 90.0°F (2007) | 37.9°F (1989) | 0.50 in (1993) |
| September 26 | 90.0°F (1998) | 39.0°F (1984) | 2.72 in (2005) |
| September 27 | 88.0°F (1999) | 32.0°F (1989) | 1.40 in (1999) |
| September 28 | 84.9°F (1987) | 32.0°F (1991) | 0.63 in (2009) |
| September 29 | 82.0°F (1986) | 34.0°F (1993) | 0.73 in (2005) |
| September 30 | 82.9°F (1979) | 37.9°F (2004) | 0.89 in (1986) |