August weather in Herculaneum, MO
The average temperature in Herculaneum in August is 76.3°F (65.4°F–87.2°F). Average precipitation: 3.59 inches.
August is a summer month in Herculaneum, and is warmer than the annual average of 55.7°F. Daily temperatures swing about 21.8°F between overnight low and afternoon high. Expect about 7 days with precipitation. Daylight averages about 13h 29m. For travel, August is a comfortable month to visit.
Avg High
87.2°F
Avg Low
65.4°F
Precipitation
3.59 in
Daylight
13h 29m
August records in Herculaneum
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| August 1 | 105.1°F (1980) | 46.0°F (1971) | 1.85 in (2020) |
| August 2 | 105.1°F (1980) | 50.0°F (1976) | 0.52 in (1994) |
| August 3 | 102.9°F (2011) | 48.0°F (1976) | 0.80 in (2023) |
| August 4 | 100.9°F (1982) | 48.0°F (1974) | 3.50 in (1998) |
| August 5 | 99.0°F (1983) | 51.1°F (1974) | 2.45 in (1970) |
| August 6 | 100.0°F (1963) | 48.9°F (1994) | 1.80 in (1965) |
| August 7 | 102.0°F (1980) | 48.0°F (1976) | 2.00 in (1999) |
| August 8 | 102.0°F (1980) | 48.0°F (1976) | 1.93 in (2014) |
| August 9 | 100.9°F (1980) | 51.1°F (1976) | 3.65 in (1970) |
| August 10 | 102.0°F (1980) | 46.9°F (1972) | 1.82 in (1995) |
| August 11 | 100.0°F (1980) | 43.0°F (1967) | 1.81 in (2025) |
| August 12 | 100.0°F (1975) | 46.9°F (2004) | 3.43 in (1993) |
| August 13 | 104.0°F (2007) | 42.1°F (1967) | 1.10 in (2011) |
| August 14 | 98.1°F (1972) | 46.9°F (1967) | 1.92 in (2016) |
| August 15 | 100.9°F (2007) | 46.9°F (1963) | 5.95 in (2016) |
| August 16 | 105.1°F (2007) | 48.9°F (1992) | 1.67 in (2018) |
| August 17 | 104.0°F (2000) | 51.1°F (1962) | 1.62 in (2014) |
| August 18 | 100.0°F (1972) | 52.0°F (1976) | 1.50 in (1998) |
| August 19 | 102.0°F (1983) | 50.0°F (1962) | 2.03 in (1997) |
| August 20 | 105.1°F (1962) | 45.0°F (1967) | 1.43 in (2006) |
| August 21 | 106.0°F (1962) | 48.0°F (1961) | 1.55 in (2010) |
| August 22 | 100.9°F (1983) | 52.0°F (1963) | 0.99 in (1977) |
| August 23 | 99.0°F (1978) | 50.0°F (1969) | 1.36 in (1996) |
| August 24 | 102.9°F (1978) | 48.9°F (1966) | 1.14 in (1962) |
| August 25 | 99.0°F (1973) | 53.1°F (1966) | 1.80 in (2001) |
| August 26 | 100.9°F (2023) | 51.1°F (1968) | 2.34 in (1975) |
| August 27 | 98.1°F (1973) | 46.9°F (1971) | 1.23 in (1982) |
| August 28 | 98.1°F (1963) | 39.9°F (1967) | 2.12 in (2014) |
| August 29 | 100.0°F (1990) | 42.1°F (1965) | 0.63 in (2004) |
| August 30 | 98.1°F (1980) | 46.9°F (1976) | 1.00 in (1978) |
| August 31 | 100.0°F (1980) | 48.0°F (1967) | 2.29 in (1981) |