September weather in St. Clair, MN
The average temperature in St. Clair in September is 61.9°F (50.1°F–73.6°F). Average precipitation: 3.30 inches.
September is a fall month in St. Clair, and is warmer than the annual average of 45.3°F. Daily temperatures swing about 23.5°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
73.6°F
Avg Low
50.1°F
Precipitation
3.30 in
Daylight
12h 17m
September records in St. Clair
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 87.1°F (1988) | 43.0°F (1987) | 1.49 in (1989) |
| September 2 | 87.1°F (1999) | 46.0°F (1998) | 1.34 in (2010) |
| September 3 | 90.0°F (1988) | 45.0°F (1984) | 5.44 in (1996) |
| September 4 | 90.0°F (2007) | 43.0°F (2010) | 0.72 in (1989) |
| September 5 | 91.9°F (2007) | 39.9°F (1984) | 0.96 in (1992) |
| September 6 | 96.1°F (1990) | 39.0°F (1988) | 2.32 in (1995) |
| September 7 | 93.0°F (2003) | 37.0°F (1986) | 0.86 in (2007) |
| September 8 | 91.9°F (2002) | 36.0°F (1986) | 0.73 in (2005) |
| September 9 | 93.0°F (2002) | 37.9°F (2008) | 0.87 in (1985) |
| September 10 | 91.0°F (2002) | 39.0°F (2008) | 0.95 in (1986) |
| September 11 | 89.1°F (2005) | 41.0°F (1992) | 2.58 in (1986) |
| September 12 | 91.9°F (1998) | 37.0°F (2007) | 2.00 in (1984) |
| September 13 | 93.9°F (1998) | 37.9°F (2007) | 2.30 in (1993) |
| September 14 | 91.9°F (1998) | 35.1°F (1996) | 1.34 in (2004) |
| September 15 | 91.9°F (1994) | 30.9°F (2007) | 2.73 in (2004) |
| September 16 | 82.9°F (1992) | 30.9°F (2007) | 0.51 in (1997) |
| September 17 | 87.1°F (1992) | 35.1°F (1984) | 0.13 in (1987) |
| September 18 | 95.0°F (1988) | 37.0°F (1984) | 0.13 in (2007) |
| September 19 | 90.0°F (2000) | 35.1°F (1991) | 1.08 in (1995) |
| September 20 | 93.0°F (1998) | 30.9°F (1991) | 0.78 in (1993) |
| September 21 | 88.0°F (2010) | 30.9°F (1999) | 0.56 in (1986) |
| September 22 | 91.0°F (2005) | 30.9°F (1995) | 0.75 in (2006) |
| September 23 | 84.0°F (2004) | 30.0°F (1989) | 3.85 in (2010) |
| September 24 | 87.1°F (2007) | 30.0°F (1989) | 1.33 in (2010) |
| September 25 | 84.0°F (1999) | 30.0°F (2000) | 2.09 in (2005) |
| September 26 | 86.0°F (1990) | 24.1°F (1984) | 0.98 in (1998) |
| September 27 | 86.0°F (1986) | 23.0°F (1984) | 0.25 in (2006) |
| September 28 | 88.0°F (1987) | 32.0°F (1991) | 0.07 in (1984) |
| September 29 | 84.9°F (2000) | 27.0°F (1984) | 0.58 in (1988) |
| September 30 | 81.0°F (2000) | 26.1°F (1984) | 0.72 in (1985) |