September weather in Charlestown, IN
The average temperature in Charlestown in September is 71.6°F (61.5°F–81.8°F). Average precipitation: 3.93 inches.
September is a fall month in Charlestown, and is warmer than the annual average of 58°F. Daily temperatures swing about 20.3°F between overnight low and afternoon high. Expect about 8 days with precipitation. Daylight averages about 12h 14m. For travel, September is a comfortable month to visit.
Avg High
81.8°F
Avg Low
61.5°F
Precipitation
3.93 in
Daylight
12h 14m
September records in Charlestown
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 100.9°F (2011) | 57.0°F (2025) | 4.35 in (1965) |
| September 2 | 100.9°F (2011) | 55.9°F (2017) | 3.20 in (2017) |
| September 3 | 102.0°F (2011) | 55.9°F (2017) | 2.17 in (1981) |
| September 4 | 93.0°F (2018) | 55.9°F (2017) | 1.71 in (2020) |
| September 5 | 93.9°F (2018) | 60.1°F (2011) | 1.38 in (1991) |
| September 6 | 93.0°F (2014) | 51.1°F (2017) | 0.99 in (1975) |
| September 7 | 93.9°F (2015) | 51.1°F (2017) | 0.55 in (1948) |
| September 8 | 93.0°F (2015) | 51.1°F (2017) | 1.52 in (1990) |
| September 9 | 93.0°F (2015) | 51.1°F (2024) | 4.27 in (2018) |
| September 10 | 93.0°F (2016) | 52.0°F (2024) | 1.48 in (1980) |
| September 11 | 99.0°F (2019) | 53.1°F (2017) | 2.15 in (2014) |
| September 12 | 93.0°F (2019) | 53.1°F (2017) | 2.44 in (1965) |
| September 13 | 95.0°F (2019) | 50.0°F (2015) | 2.05 in (1963) |
| September 14 | 96.1°F (2019) | 41.0°F (2014) | 3.75 in (1979) |
| September 15 | 90.0°F (2016) | 41.0°F (2014) | 1.79 in (1965) |
| September 16 | 93.9°F (2019) | 53.1°F (2011) | 1.37 in (1996) |
| September 17 | 95.0°F (2019) | 54.0°F (2014) | 1.08 in (1995) |
| September 18 | 91.9°F (2019) | 53.1°F (2014) | 0.53 in (1994) |
| September 19 | 93.0°F (2018) | 51.1°F (2012) | 0.75 in (2011) |
| September 20 | 93.0°F (2018) | 45.0°F (2012) | 3.78 in (1954) |
| September 21 | 93.0°F (2018) | 46.9°F (2012) | 5.70 in (2009) |
| September 22 | 96.1°F (2022) | 52.0°F (2015) | 3.67 in (1979) |
| September 23 | 91.0°F (2016) | 45.0°F (2015) | 5.00 in (2006) |
| September 24 | 91.0°F (2017) | 42.1°F (2012) | 1.85 in (2006) |
| September 25 | 91.0°F (2016) | 46.0°F (2021) | 4.08 in (2011) |
| September 26 | 90.0°F (2016) | 52.0°F (2021) | 1.43 in (2000) |
| September 27 | 90.0°F (2017) | 48.9°F (2022) | 5.75 in (2002) |
| September 28 | 93.0°F (2019) | 46.0°F (2022) | 2.00 in (2024) |
| September 29 | 93.9°F (2019) | 46.0°F (2022) | 0.72 in (1974) |
| September 30 | 91.9°F (2019) | 46.0°F (2022) | 1.71 in (1955) |