September weather in Ontonagon, MI
The average temperature in Ontonagon in September is 59.4°F (48.4°F–70.5°F). Average precipitation: 2.95 inches.
September is a fall month in Ontonagon, and is warmer than the annual average of 43.3°F. Daily temperatures swing about 22.1°F between overnight low and afternoon high. Expect about 11 days with precipitation. Daylight averages about 12h 19m. For travel, September is a comfortable month to visit.
Avg High
70.5°F
Avg Low
48.4°F
Precipitation
2.95 in
Snow
0.1 in
September records in Ontonagon
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 91.9°F (2008) | 37.0°F (1991) | 0.46 in (1981) |
| September 2 | 91.9°F (2008) | 37.0°F (1994) | 1.53 in (1979) |
| September 3 | 93.0°F (1999) | 35.1°F (1997) | 1.84 in (1985) |
| September 4 | 91.0°F (2012) | 34.0°F (2000) | 1.12 in (2007) |
| September 5 | 96.1°F (1998) | 35.1°F (1981) | 2.31 in (1983) |
| September 6 | 90.0°F (2007) | 32.0°F (1988) | 1.33 in (1995) |
| September 7 | 86.0°F (2007) | 28.9°F (1986) | 0.71 in (1981) |
| September 8 | 86.0°F (1983) | 32.0°F (1995) | 0.77 in (2001) |
| September 9 | 86.0°F (2003) | 28.0°F (2006) | 0.66 in (1999) |
| September 10 | 91.0°F (2005) | 28.9°F (2006) | 1.85 in (2014) |
| September 11 | 97.0°F (2005) | 34.0°F (1992) | 0.95 in (1979) |
| September 12 | 87.1°F (2011) | 34.0°F (1985) | 0.72 in (1999) |
| September 13 | 87.1°F (1990) | 35.1°F (1985) | 1.73 in (1980) |
| September 14 | 84.9°F (1997) | 33.1°F (1986) | 1.15 in (1990) |
| September 15 | 82.9°F (1994) | 30.0°F (2007) | 0.51 in (2004) |
| September 16 | 82.0°F (2005) | 30.9°F (1986) | 0.71 in (2010) |
| September 17 | 84.0°F (1979) | 30.0°F (1980) | 0.42 in (1992) |
| September 18 | 88.0°F (2000) | 30.9°F (2014) | 0.87 in (1992) |
| September 19 | 89.1°F (1985) | 30.0°F (1979) | 0.78 in (1987) |
| September 20 | 82.9°F (2005) | 32.0°F (1995) | 0.62 in (1988) |
| September 21 | 84.9°F (2005) | 30.0°F (1982) | 1.79 in (2007) |
| September 22 | 82.0°F (2004) | 25.0°F (1981) | 0.62 in (1995) |
| September 23 | 82.0°F (2007) | 26.1°F (1992) | 1.40 in (1985) |
| September 24 | 87.1°F (2007) | 27.0°F (1989) | 1.85 in (1984) |
| September 25 | 82.9°F (2007) | 27.0°F (2001) | 0.77 in (1980) |
| September 26 | 84.9°F (2008) | 28.9°F (2010) | 0.71 in (1998) |
| September 27 | 86.0°F (1987) | 27.0°F (1991) | 0.62 in (2011) |
| September 28 | 82.9°F (2014) | 27.0°F (2000) | 1.31 in (2009) |
| September 29 | 81.0°F (2000) | 27.0°F (1984) | 0.73 in (2009) |
| September 30 | 81.0°F (2000) | 28.0°F (1993) | 1.60 in (2007) |