August weather in Johnston, SC
The average temperature in Johnston in August is 79.3°F (67.9°F–90.8°F). Average precipitation: 4.96 inches.
August is a summer month in Johnston, and is warmer than the annual average of 62.7°F. Daily temperatures swing about 22.9°F between overnight low and afternoon high. Expect about 11 days with precipitation. Daylight averages about 13h 16m. For travel, August is hot.
Avg High
90.8°F
Avg Low
67.9°F
Precipitation
4.96 in
Daylight
13h 16m
August records in Johnston
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| August 1 | 104.0°F (1999) | 55.9°F (1997) | 2.90 in (1978) |
| August 2 | 105.1°F (1999) | 55.9°F (1997) | 3.59 in (2000) |
| August 3 | 102.9°F (1980) | 59.0°F (1998) | 2.56 in (1977) |
| August 4 | 104.0°F (2011) | 57.9°F (1998) | 2.55 in (2010) |
| August 5 | 102.0°F (2004) | 55.9°F (1998) | 1.33 in (1969) |
| August 6 | 102.9°F (2015) | 55.0°F (1998) | 2.21 in (1974) |
| August 7 | 104.0°F (2007) | 48.9°F (2004) | 1.28 in (2024) |
| August 8 | 106.0°F (2007) | 46.9°F (2004) | 2.21 in (1995) |
| August 9 | 107.1°F (2007) | 50.0°F (2002) | 1.97 in (2014) |
| August 10 | 109.0°F (2007) | 50.0°F (2002) | 2.24 in (1980) |
| August 11 | 109.9°F (2007) | 55.0°F (2002) | 1.94 in (2003) |
| August 12 | 105.1°F (1999) | 55.0°F (2002) | 2.35 in (1972) |
| August 13 | 100.9°F (1999) | 53.1°F (1979) | 2.81 in (2009) |
| August 14 | 105.1°F (1999) | 53.1°F (2002) | 4.33 in (1992) |
| August 15 | 107.1°F (1999) | 54.0°F (1979) | 1.63 in (1978) |
| August 16 | 106.0°F (2007) | 57.9°F (1967) | 2.30 in (1971) |
| August 17 | 105.1°F (2007) | 57.9°F (1979) | 2.80 in (2013) |
| August 18 | 107.1°F (2007) | 57.9°F (1979) | 2.96 in (2021) |
| August 19 | 102.9°F (2000) | 57.0°F (1979) | 1.69 in (2013) |
| August 20 | 102.0°F (1999) | 57.0°F (2004) | 2.99 in (1992) |
| August 21 | 102.9°F (1983) | 55.9°F (1977) | 1.15 in (1961) |
| August 22 | 106.0°F (1983) | 7.0°F (2003) | 1.97 in (1967) |
| August 23 | 104.0°F (1983) | 53.1°F (1998) | 1.39 in (2021) |
| August 24 | 104.0°F (2002) | 55.0°F (1978) | 2.09 in (1967) |
| August 25 | 107.1°F (2002) | 54.0°F (1969) | 3.68 in (1985) |
| August 26 | 100.0°F (1975) | 53.1°F (1997) | 2.02 in (1995) |
| August 27 | 99.0°F (1959) | 57.0°F (1980) | 1.42 in (2007) |
| August 28 | 102.0°F (1998) | 55.0°F (1969) | 2.30 in (1975) |
| August 29 | 102.9°F (1998) | 55.0°F (1968) | 1.88 in (1964) |
| August 30 | 102.9°F (1998) | 46.0°F (1969) | 6.35 in (1964) |
| August 31 | 104.0°F (1998) | 55.0°F (1986) | 3.10 in (2015) |