September weather in Plymouth, IN
The average temperature in Plymouth in September is 64.8°F (53.5°F–76.1°F). Average precipitation: 3.20 inches.
September is a fall month in Plymouth, and is warmer than the annual average of 50°F. Daily temperatures swing about 22.6°F between overnight low and afternoon high. Expect about 9 days with precipitation. Daylight averages about 12h 16m. For travel, September is one of the best months of the year to visit.
Avg High
76.1°F
Avg Low
53.5°F
Precipitation
3.20 in
Daylight
12h 16m
September records in Plymouth
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 91.0°F (2012) | 43.0°F (2009) | 1.58 in (2003) |
| September 2 | 96.1°F (2011) | 43.0°F (2017) | 0.61 in (2003) |
| September 3 | 98.1°F (2011) | 46.0°F (1994) | 2.01 in (1993) |
| September 4 | 95.0°F (2011) | 42.1°F (1997) | 1.03 in (2004) |
| September 5 | 91.9°F (1999) | 42.1°F (1997) | 0.97 in (2008) |
| September 6 | 93.0°F (1990) | 44.1°F (2003) | 0.87 in (2014) |
| September 7 | 93.9°F (1998) | 44.1°F (2000) | 0.76 in (1990) |
| September 8 | 91.9°F (2002) | 39.9°F (2024) | 0.38 in (2021) |
| September 9 | 93.9°F (2002) | 39.9°F (2024) | 2.80 in (2007) |
| September 10 | 91.9°F (2002) | 37.9°F (2017) | 3.99 in (2016) |
| September 11 | 96.1°F (2013) | 37.9°F (2017) | 2.74 in (2014) |
| September 12 | 95.0°F (2013) | 41.0°F (2017) | 1.67 in (2000) |
| September 13 | 91.0°F (2005) | 41.0°F (2015) | 1.50 in (2008) |
| September 14 | 91.9°F (1998) | 39.0°F (2013) | 1.57 in (2006) |
| September 15 | 90.0°F (1991) | 39.0°F (2007) | 2.96 in (2008) |
| September 16 | 87.1°F (1991) | 37.9°F (2011) | 1.15 in (2005) |
| September 17 | 87.1°F (2018) | 39.0°F (2011) | 0.65 in (1997) |
| September 18 | 89.1°F (2018) | 39.0°F (1995) | 0.56 in (2016) |
| September 19 | 87.1°F (2018) | 37.9°F (1995) | 2.55 in (2015) |
| September 20 | 90.0°F (2021) | 35.1°F (2020) | 1.21 in (2017) |
| September 21 | 93.0°F (2018) | 34.0°F (1991) | 1.33 in (1992) |
| September 22 | 91.9°F (2017) | 34.0°F (1999) | 1.42 in (2025) |
| September 23 | 91.9°F (2017) | 30.0°F (1995) | 0.87 in (2024) |
| September 24 | 91.0°F (2017) | 32.0°F (1995) | 0.85 in (2024) |
| September 25 | 91.0°F (2007) | 36.0°F (2012) | 0.69 in (2011) |
| September 26 | 89.1°F (2017) | 35.1°F (2000) | 1.26 in (2005) |
| September 27 | 91.0°F (1998) | 33.1°F (2000) | 1.03 in (1992) |
| September 28 | 86.0°F (1999) | 32.0°F (1991) | 3.40 in (2019) |
| September 29 | 84.0°F (2025) | 35.1°F (1992) | 1.24 in (1999) |
| September 30 | 84.0°F (2025) | 33.1°F (1993) | 0.29 in (2019) |