September weather in Johnston, SC
The average temperature in Johnston in September is 73.9°F (62.3°F–85.5°F). Average precipitation: 3.97 inches.
September is a fall month in Johnston, and is warmer than the annual average of 62.7°F. Daily temperatures swing about 23.2°F between overnight low and afternoon high. Expect about 9 days with precipitation. Daylight averages about 12h 12m. For travel, September is a comfortable month to visit.
Avg High
85.5°F
Avg Low
62.3°F
Precipitation
3.97 in
Daylight
12h 12m
September records in Johnston
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 100.9°F (1998) | 51.1°F (1999) | 2.14 in (2009) |
| September 2 | 100.0°F (2014) | 51.1°F (1999) | 0.97 in (1979) |
| September 3 | 99.0°F (1993) | 53.1°F (1967) | 2.46 in (2016) |
| September 4 | 100.0°F (2010) | 53.1°F (2007) | 5.36 in (1998) |
| September 5 | 95.0°F (1962) | 46.9°F (1997) | 2.55 in (1979) |
| September 6 | 99.0°F (1999) | 46.0°F (1997) | 1.10 in (2000) |
| September 7 | 105.1°F (1999) | 54.0°F (1997) | 1.94 in (2004) |
| September 8 | 97.0°F (2018) | 53.1°F (1965) | 2.82 in (2004) |
| September 9 | 98.1°F (2010) | 48.0°F (1967) | 2.52 in (1988) |
| September 10 | 96.1°F (2010) | 48.0°F (1967) | 0.77 in (2022) |
| September 11 | 97.0°F (2002) | 46.9°F (1998) | 2.60 in (1996) |
| September 12 | 100.9°F (2002) | 50.0°F (1977) | 3.34 in (2017) |
| September 13 | 95.0°F (1983) | 50.0°F (1977) | 1.78 in (2006) |
| September 14 | 95.0°F (1962) | 45.0°F (1985) | 3.41 in (1983) |
| September 15 | 98.1°F (1991) | 44.1°F (1967) | 3.21 in (1976) |
| September 16 | 99.0°F (1991) | 45.0°F (2001) | 2.03 in (2021) |
| September 17 | 97.0°F (1991) | 46.9°F (2001) | 0.71 in (1996) |
| September 18 | 97.0°F (2005) | 45.0°F (2001) | 3.75 in (2020) |
| September 19 | 96.1°F (2005) | 45.0°F (1981) | 2.01 in (2000) |
| September 20 | 98.1°F (1997) | 44.1°F (1984) | 3.11 in (1971) |
| September 21 | 100.9°F (1997) | 43.0°F (1991) | 1.91 in (1999) |
| September 22 | 100.0°F (2010) | 44.1°F (2006) | 1.80 in (1989) |
| September 23 | 97.0°F (1980) | 42.1°F (1999) | 3.07 in (2000) |
| September 24 | 99.0°F (1980) | 45.0°F (1999) | 0.76 in (1995) |
| September 25 | 95.0°F (1980) | 44.1°F (1999) | 2.72 in (2015) |
| September 26 | 95.0°F (1961) | 45.0°F (2001) | 2.51 in (2024) |
| September 27 | 93.9°F (1961) | 41.0°F (2001) | 3.83 in (2024) |
| September 28 | 95.0°F (1986) | 43.0°F (1991) | 4.13 in (2004) |
| September 29 | 95.0°F (1986) | 42.1°F (1993) | 4.03 in (1963) |
| September 30 | 93.0°F (2019) | 36.0°F (1967) | 5.21 in (1959) |