August weather in St. John, MO
The average temperature in St. John in August is 78.8°F (69.3°F–88.3°F). Average precipitation: 3.38 inches.
August is a summer month in St. John, and is warmer than the annual average of 57.4°F. Daily temperatures swing about 19°F between overnight low and afternoon high. Expect about 8 days with precipitation. Daylight averages about 13h 31m. For travel, August is hot.
Avg High
88.3°F
Avg Low
69.3°F
Precipitation
3.38 in
Daylight
13h 31m
August records in St. John
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| August 1 | 104.0°F (1980) | 57.0°F (1962) | 0.92 in (1954) |
| August 2 | 102.9°F (1987) | 57.9°F (1973) | 1.13 in (1995) |
| August 3 | 104.0°F (1964) | 54.0°F (1950) | 4.32 in (2022) |
| August 4 | 102.0°F (1947) | 55.0°F (1974) | 1.18 in (2004) |
| August 5 | 102.0°F (1947) | 55.9°F (1948) | 3.25 in (2015) |
| August 6 | 104.0°F (1947) | 55.0°F (1948) | 2.68 in (2002) |
| August 7 | 100.0°F (1980) | 55.0°F (1972) | 1.79 in (2014) |
| August 8 | 102.0°F (1980) | 53.1°F (1976) | 2.20 in (1982) |
| August 9 | 105.1°F (1980) | 55.0°F (1972) | 2.03 in (2020) |
| August 10 | 100.9°F (1941) | 54.0°F (1972) | 1.95 in (1949) |
| August 11 | 102.0°F (1941) | 55.9°F (1967) | 2.34 in (1939) |
| August 12 | 102.0°F (2007) | 51.1°F (1967) | 2.68 in (2019) |
| August 13 | 100.0°F (2010) | 50.0°F (1964) | 1.18 in (1973) |
| August 14 | 102.9°F (2007) | 55.9°F (1967) | 2.21 in (1946) |
| August 15 | 105.1°F (2007) | 51.1°F (1992) | 4.31 in (1946) |
| August 16 | 102.0°F (1988) | 55.9°F (1964) | 2.35 in (1946) |
| August 17 | 102.9°F (1988) | 57.9°F (1943) | 1.89 in (1939) |
| August 18 | 102.9°F (1954) | 54.0°F (1963) | 1.27 in (1967) |
| August 19 | 105.1°F (1962) | 55.0°F (1953) | 1.24 in (1997) |
| August 20 | 104.0°F (1962) | 52.0°F (1950) | 1.02 in (1951) |
| August 21 | 104.0°F (2003) | 50.0°F (1940) | 2.07 in (1944) |
| August 22 | 100.0°F (1938) | 55.0°F (1950) | 2.01 in (1983) |
| August 23 | 102.0°F (1938) | 54.0°F (1966) | 1.58 in (1977) |
| August 24 | 102.9°F (1947) | 51.1°F (1942) | 1.26 in (1962) |
| August 25 | 104.0°F (2023) | 52.0°F (1958) | 1.30 in (2004) |
| August 26 | 100.9°F (1943) | 55.0°F (1945) | 1.76 in (1992) |
| August 27 | 102.0°F (2024) | 51.1°F (1968) | 1.12 in (1992) |
| August 28 | 100.9°F (1990) | 48.0°F (1986) | 2.53 in (1974) |
| August 29 | 107.1°F (1984) | 46.9°F (1965) | 1.53 in (1975) |
| August 30 | 102.0°F (2013) | 51.1°F (1946) | 1.04 in (1994) |
| August 31 | 102.9°F (2011) | 48.9°F (1967) | 1.48 in (2012) |