August weather in Vandalia, IL
The average temperature in Vandalia in August is 75.2°F (64.4°F–85.9°F). Average precipitation: 3.24 inches.
August is a summer month in Vandalia, and is warmer than the annual average of 54.2°F. Daily temperatures swing about 21.5°F between overnight low and afternoon high. Expect about 7 days with precipitation. Daylight averages about 13h 32m. For travel, August is a comfortable month to visit.
Avg High
85.9°F
Avg Low
64.4°F
Precipitation
3.24 in
Daylight
13h 32m
August records in Vandalia
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| August 1 | 100.0°F (2012) | 54.0°F (1992) | 1.28 in (1934) |
| August 2 | 106.0°F (1901) | 54.0°F (1904) | 0.74 in (1979) |
| August 3 | 100.0°F (2012) | 54.0°F (1976) | 1.76 in (2012) |
| August 4 | 98.1°F (1903) | 52.0°F (1976) | 3.78 in (1984) |
| August 5 | 100.0°F (1980) | 53.1°F (1974) | 1.03 in (1998) |
| August 6 | 98.1°F (1983) | 50.0°F (1994) | 0.71 in (2011) |
| August 7 | 97.0°F (1901) | 51.1°F (1990) | 2.25 in (1939) |
| August 8 | 99.0°F (1901) | 54.0°F (1976) | 1.62 in (2005) |
| August 9 | 102.9°F (1980) | 53.1°F (1976) | 2.40 in (1984) |
| August 10 | 102.9°F (1980) | 55.0°F (1976) | 1.71 in (1986) |
| August 11 | 102.9°F (1980) | 53.1°F (2012) | 0.80 in (1982) |
| August 12 | 97.0°F (1988) | 48.0°F (1902) | 2.00 in (1944) |
| August 13 | 100.9°F (2007) | 50.0°F (2004) | 1.05 in (1903) |
| August 14 | 97.0°F (1901) | 51.1°F (2004) | 1.11 in (2005) |
| August 15 | 98.1°F (1901) | 50.0°F (1992) | 1.38 in (1976) |
| August 16 | 102.9°F (2007) | 50.0°F (2004) | 0.90 in (2005) |
| August 17 | 100.9°F (1988) | 53.1°F (2004) | 2.71 in (2012) |
| August 18 | 100.9°F (1900) | 52.0°F (2012) | 2.30 in (1902) |
| August 19 | 100.9°F (1988) | 53.1°F (1977) | 1.60 in (1904) |
| August 20 | 100.9°F (1983) | 53.1°F (1992) | 2.23 in (1904) |
| August 21 | 104.0°F (1983) | 51.1°F (1903) | 1.01 in (2010) |
| August 22 | 102.0°F (1983) | 52.0°F (1978) | 1.05 in (1984) |
| August 23 | 97.0°F (1903) | 41.0°F (1904) | 1.90 in (1900) |
| August 24 | 100.0°F (1903) | 50.0°F (1984) | 2.76 in (1977) |
| August 25 | 97.0°F (1978) | 51.1°F (1984) | 0.88 in (2001) |
| August 26 | 98.1°F (1980) | 50.0°F (1984) | 2.22 in (2004) |
| August 27 | 100.0°F (1980) | 48.0°F (1904) | 3.15 in (1940) |
| August 28 | 100.0°F (1983) | 46.0°F (1986) | 1.70 in (1978) |
| August 29 | 98.1°F (2007) | 43.0°F (1986) | 1.28 in (2004) |
| August 30 | 98.1°F (2007) | 44.1°F (1986) | 1.27 in (1975) |
| August 31 | 100.0°F (1983) | 46.9°F (1987) | 0.74 in (1997) |