July weather in Lake St. Louis, MO
The average temperature in Lake St. Louis in July is 77.4°F (67.3°F–87.5°F). Average precipitation: 3.92 inches.
July is a summer month in Lake St. Louis, and is warmer than the annual average of 55.2°F. Daily temperatures swing about 20.2°F between overnight low and afternoon high. Expect about 8 days with precipitation. Daylight averages about 14h 28m. For travel, July is a comfortable month to visit.
Avg High
87.5°F
Avg Low
67.3°F
Precipitation
3.92 in
Daylight
14h 28m
July records in Lake St. Louis
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| July 1 | 100.9°F (2012) | 48.0°F (1988) | 1.65 in (1960) |
| July 2 | 100.9°F (2012) | 50.0°F (1959) | 2.24 in (1986) |
| July 3 | 100.0°F (2012) | 50.0°F (1959) | 4.59 in (1980) |
| July 4 | 98.1°F (2012) | 46.9°F (1967) | 2.94 in (2024) |
| July 5 | 100.9°F (2012) | 46.9°F (1972) | 2.75 in (1981) |
| July 6 | 102.9°F (2012) | 51.1°F (1967) | 2.24 in (2004) |
| July 7 | 106.0°F (2012) | 46.0°F (1983) | 4.45 in (1987) |
| July 8 | 107.1°F (2012) | 43.0°F (1996) | 1.27 in (1994) |
| July 9 | 98.1°F (2012) | 48.9°F (1983) | 1.76 in (2025) |
| July 10 | 102.9°F (1966) | 51.1°F (1961) | 4.10 in (1991) |
| July 11 | 104.0°F (1966) | 50.0°F (1975) | 1.56 in (2019) |
| July 12 | 105.1°F (1966) | 43.0°F (1996) | 3.58 in (1964) |
| July 13 | 104.0°F (1966) | 45.0°F (1975) | 2.64 in (2010) |
| July 14 | 104.0°F (1966) | 48.0°F (1967) | 2.32 in (1971) |
| July 15 | 105.1°F (1966) | 51.1°F (1967) | 1.49 in (1978) |
| July 16 | 100.0°F (1988) | 54.0°F (1967) | 1.26 in (1981) |
| July 17 | 100.0°F (1988) | 50.0°F (1976) | 1.90 in (2024) |
| July 18 | 100.0°F (1974) | 51.1°F (1976) | 2.00 in (1988) |
| July 19 | 102.9°F (2012) | 48.9°F (1984) | 2.06 in (2003) |
| July 20 | 102.0°F (2012) | 55.0°F (2009) | 1.63 in (2006) |
| July 21 | 99.0°F (1983) | 52.0°F (1970) | 2.73 in (2025) |
| July 22 | 100.0°F (1983) | 50.0°F (1966) | 2.09 in (2019) |
| July 23 | 102.0°F (2017) | 53.1°F (1988) | 1.02 in (1961) |
| July 24 | 104.0°F (2012) | 55.9°F (1980) | 0.97 in (1967) |
| July 25 | 105.1°F (2012) | 52.0°F (1975) | 2.38 in (1983) |
| July 26 | 105.1°F (2012) | 50.0°F (1962) | 3.13 in (2022) |
| July 27 | 100.0°F (1976) | 45.0°F (1962) | 2.38 in (2022) |
| July 28 | 99.0°F (2012) | 51.1°F (2013) | 2.50 in (1981) |
| July 29 | 99.0°F (1976) | 50.0°F (1984) | 1.59 in (1957) |
| July 30 | 99.0°F (1983) | 53.1°F (1974) | 2.41 in (1998) |
| July 31 | 99.0°F (1987) | 51.1°F (1971) | 2.01 in (2008) |