September weather in Mount Ayr, IN
The average temperature in Mount Ayr in September is 65.2°F (53.2°F–77.2°F). Average precipitation: 3.24 inches.
September is a fall month in Mount Ayr, and is warmer than the annual average of 50.5°F. Daily temperatures swing about 24°F between overnight low and afternoon high. Expect about 9 days with precipitation. Daylight averages about 12h 15m. For travel, September is one of the best months of the year to visit.
Avg High
77.2°F
Avg Low
53.2°F
Precipitation
3.24 in
Daylight
12h 15m
September records in Mount Ayr
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 93.0°F (2000) | 46.9°F (2009) | 3.70 in (1989) |
| September 2 | 93.9°F (2000) | 44.1°F (2017) | 2.27 in (1993) |
| September 3 | 93.0°F (1984) | 43.0°F (1974) | 0.77 in (2002) |
| September 4 | 93.0°F (2011) | 39.9°F (1974) | 0.92 in (2004) |
| September 5 | 93.9°F (2018) | 42.1°F (1974) | 1.61 in (2008) |
| September 6 | 96.1°F (1998) | 42.1°F (1984) | 1.57 in (1971) |
| September 7 | 93.9°F (1990) | 39.0°F (2025) | 1.12 in (1989) |
| September 8 | 93.0°F (1985) | 37.9°F (1986) | 1.56 in (1972) |
| September 9 | 91.0°F (1985) | 41.0°F (2024) | 2.12 in (1992) |
| September 10 | 95.0°F (1983) | 42.1°F (1972) | 2.06 in (2016) |
| September 11 | 97.0°F (2013) | 44.1°F (1970) | 1.06 in (1993) |
| September 12 | 95.0°F (2013) | 43.0°F (1970) | 1.80 in (1974) |
| September 13 | 91.9°F (1991) | 37.9°F (1975) | 1.12 in (1977) |
| September 14 | 91.9°F (1991) | 37.9°F (1975) | 2.40 in (1993) |
| September 15 | 91.0°F (1991) | 39.0°F (2007) | 3.17 in (2008) |
| September 16 | 93.9°F (1991) | 37.0°F (1984) | 0.57 in (2005) |
| September 17 | 90.0°F (2018) | 37.0°F (1984) | 1.62 in (1980) |
| September 18 | 91.9°F (2018) | 39.9°F (1984) | 0.82 in (1982) |
| September 19 | 90.0°F (1983) | 35.1°F (2012) | 1.21 in (1997) |
| September 20 | 91.0°F (1998) | 35.1°F (1991) | 1.29 in (1988) |
| September 21 | 95.0°F (2018) | 36.0°F (1991) | 0.96 in (2021) |
| September 22 | 91.9°F (2010) | 30.0°F (1995) | 1.17 in (1970) |
| September 23 | 93.9°F (2017) | 30.0°F (1974) | 0.90 in (1972) |
| September 24 | 93.0°F (2017) | 30.9°F (2012) | 2.37 in (1970) |
| September 25 | 91.9°F (2007) | 34.0°F (2012) | 1.20 in (1972) |
| September 26 | 91.0°F (1998) | 36.0°F (2000) | 1.70 in (2005) |
| September 27 | 90.0°F (1998) | 32.0°F (1991) | 2.25 in (1981) |
| September 28 | 86.0°F (1999) | 34.0°F (1991) | 4.60 in (2019) |
| September 29 | 87.1°F (1986) | 33.1°F (1993) | 1.54 in (1999) |
| September 30 | 88.0°F (2025) | 33.1°F (1984) | 2.30 in (1986) |