August weather in Sullivan's Island, SC
The average temperature in Sullivan's Island in August is 81.0°F (72.0°F–90.0°F). Average precipitation: 6.72 inches.
August is a summer month in Sullivan's Island, and is warmer than the annual average of 65.5°F. Daily temperatures swing about 18°F between overnight low and afternoon high. Daylight averages about 13h 13m. For travel, August is a wet month.
Avg High
90.0°F
Avg Low
72.0°F
Precipitation
6.72 in
Daylight
13h 13m
August records in Sullivan's Island
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| August 1 | 100.0°F (1958) | 63.0°F (1997) | 2.57 in (1969) |
| August 2 | 102.9°F (1999) | 61.0°F (1966) | 1.56 in (2015) |
| August 3 | 97.0°F (1953) | 63.0°F (2017) | 2.18 in (2016) |
| August 4 | 98.1°F (2006) | 64.0°F (2007) | 4.15 in (1969) |
| August 5 | 102.0°F (1954) | 59.0°F (1986) | 4.76 in (1961) |
| August 6 | 100.0°F (2010) | 64.0°F (1969) | 3.47 in (1974) |
| August 7 | 100.0°F (1968) | 63.0°F (2004) | 4.10 in (1990) |
| August 8 | 100.0°F (2010) | 64.0°F (1978) | 1.00 in (2005) |
| August 9 | 100.0°F (2011) | 61.0°F (1989) | 2.91 in (2025) |
| August 10 | 98.1°F (2011) | 63.0°F (1989) | 0.95 in (1975) |
| August 11 | 97.0°F (2019) | 62.1°F (1989) | 2.63 in (1967) |
| August 12 | 99.0°F (2008) | 64.9°F (1967) | 1.27 in (1986) |
| August 13 | 98.1°F (1995) | 60.1°F (2007) | 4.96 in (2008) |
| August 14 | 98.1°F (1995) | 62.1°F (1979) | 2.50 in (1986) |
| August 15 | 100.9°F (1989) | 63.0°F (2008) | 2.70 in (2013) |
| August 16 | 98.1°F (2011) | 64.9°F (2013) | 2.00 in (2010) |
| August 17 | 98.1°F (1958) | 66.9°F (1971) | 1.24 in (1964) |
| August 18 | 97.0°F (1995) | 62.1°F (1967) | 2.12 in (1953) |
| August 19 | 98.1°F (1983) | 68.0°F (1960) | 3.42 in (2015) |
| August 20 | 95.0°F (1966) | 66.9°F (1957) | 4.35 in (1981) |
| August 21 | 97.0°F (1968) | 64.0°F (2007) | 2.11 in (2020) |
| August 22 | 97.0°F (2005) | 64.0°F (1998) | 6.53 in (2025) |
| August 23 | 98.1°F (1987) | 64.9°F (1977) | 3.96 in (2025) |
| August 24 | 99.0°F (2014) | 62.1°F (1981) | 2.50 in (1989) |
| August 25 | 97.0°F (1982) | 61.0°F (1981) | 2.37 in (2006) |
| August 26 | 97.0°F (1965) | 64.0°F (1952) | 2.00 in (1963) |
| August 27 | 100.9°F (1989) | 63.0°F (1966) | 2.40 in (1962) |
| August 28 | 96.1°F (1990) | 60.1°F (1968) | 2.35 in (1986) |
| August 29 | 98.1°F (2010) | 57.0°F (1986) | 3.45 in (2017) |
| August 30 | 99.0°F (1989) | 60.1°F (1986) | 2.50 in (2002) |
| August 31 | 98.1°F (1989) | 55.0°F (2010) | 2.84 in (1952) |