September weather in Roscommon, MI
The average temperature in Roscommon in September is 58.3°F (46.1°F–70.6°F). Average precipitation: 2.59 inches.
September is a fall month in Roscommon, and is warmer than the annual average of 44.1°F. Daily temperatures swing about 24.5°F between overnight low and afternoon high. Expect about 11 days with precipitation. Daylight averages about 12h 17m. For travel, September is a comfortable month to visit.
Avg High
70.6°F
Avg Low
46.1°F
Precipitation
2.59 in
Daylight
12h 17m
September records in Roscommon
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 90.0°F (2011) | 34.0°F (2009) | 1.44 in (1982) |
| September 2 | 88.0°F (2015) | 30.9°F (1976) | 1.19 in (1970) |
| September 3 | 89.1°F (1973) | 32.0°F (1987) | 1.32 in (2015) |
| September 4 | 88.0°F (2023) | 30.9°F (1997) | 0.97 in (2008) |
| September 5 | 89.1°F (2023) | 33.1°F (2003) | 1.75 in (1985) |
| September 6 | 90.0°F (2016) | 34.0°F (1976) | 1.07 in (1990) |
| September 7 | 91.9°F (1985) | 36.0°F (1988) | 1.62 in (2021) |
| September 8 | 90.0°F (2002) | 30.9°F (2025) | 2.17 in (1985) |
| September 9 | 90.0°F (2002) | 32.0°F (2017) | 1.51 in (1996) |
| September 10 | 90.0°F (2013) | 32.0°F (2008) | 2.30 in (1986) |
| September 11 | 87.1°F (1998) | 30.9°F (1967) | 1.48 in (1986) |
| September 12 | 88.0°F (2005) | 30.0°F (1964) | 1.22 in (2006) |
| September 13 | 86.0°F (2005) | 32.0°F (2014) | 1.28 in (1978) |
| September 14 | 84.0°F (2004) | 30.0°F (1975) | 1.38 in (1978) |
| September 15 | 84.9°F (2024) | 27.0°F (1964) | 0.92 in (1986) |
| September 16 | 84.0°F (2024) | 27.0°F (1964) | 1.06 in (1980) |
| September 17 | 86.0°F (2018) | 28.2°F (2013) | 1.88 in (1987) |
| September 18 | 82.0°F (1967) | 30.0°F (1990) | 0.83 in (1983) |
| September 19 | 82.9°F (2000) | 26.2°F (2020) | 1.43 in (1997) |
| September 20 | 86.0°F (1998) | 31.1°F (2020) | 1.35 in (2002) |
| September 21 | 88.0°F (2017) | 30.0°F (1973) | 1.55 in (1964) |
| September 22 | 91.9°F (2017) | 28.0°F (1999) | 1.09 in (1965) |
| September 23 | 91.0°F (2017) | 26.1°F (1998) | 0.80 in (2021) |
| September 24 | 91.0°F (2017) | 24.1°F (1976) | 1.26 in (1968) |
| September 25 | 89.1°F (2017) | 28.0°F (1966) | 2.00 in (2005) |
| September 26 | 88.0°F (2017) | 26.1°F (1989) | 1.04 in (1998) |
| September 27 | 81.0°F (2025) | 21.0°F (1989) | 0.40 in (2022) |
| September 28 | 79.0°F (1979) | 23.0°F (1991) | 1.08 in (1999) |
| September 29 | 81.0°F (1979) | 28.0°F (1964) | 1.25 in (1986) |
| September 30 | 80.1°F (1982) | 26.1°F (1984) | 0.49 in (1981) |