July weather in Vandalia, IL
The average temperature in Vandalia in July is 76.7°F (66.6°F–86.8°F). Average precipitation: 3.90 inches.
July is a summer month in Vandalia, and is warmer than the annual average of 54.2°F. Daily temperatures swing about 20.2°F between overnight low and afternoon high. Expect about 8 days with precipitation. Daylight averages about 14h 29m. For travel, July is a comfortable month to visit.
Avg High
86.8°F
Avg Low
66.6°F
Precipitation
3.90 in
Daylight
14h 29m
July records in Vandalia
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| July 1 | 104.0°F (2012) | 55.0°F (1974) | 2.64 in (2025) |
| July 2 | 100.9°F (2012) | 48.9°F (1904) | 1.13 in (1992) |
| July 3 | 100.9°F (2012) | 54.0°F (1904) | 1.60 in (1905) |
| July 4 | 99.0°F (1901) | 55.9°F (1996) | 0.78 in (1903) |
| July 5 | 100.9°F (2012) | 55.9°F (1996) | 2.20 in (1905) |
| July 6 | 102.0°F (2012) | 55.0°F (1983) | 1.95 in (2004) |
| July 7 | 102.9°F (2012) | 50.0°F (1983) | 1.07 in (1999) |
| July 8 | 105.1°F (2012) | 48.0°F (1901) | 1.86 in (1942) |
| July 9 | 97.0°F (1903) | 54.0°F (1901) | 2.30 in (1933) |
| July 10 | 105.1°F (1901) | 54.0°F (1996) | 1.86 in (1999) |
| July 11 | 108.0°F (1901) | 55.0°F (1978) | 2.17 in (1951) |
| July 12 | 99.0°F (1901) | 55.0°F (1975) | 1.50 in (1903) |
| July 13 | 99.0°F (1980) | 57.0°F (1999) | 2.20 in (1904) |
| July 14 | 98.1°F (1995) | 48.9°F (1975) | 1.96 in (1934) |
| July 15 | 100.0°F (1901) | 57.9°F (2001) | 1.14 in (2009) |
| July 16 | 102.9°F (1980) | 57.0°F (1985) | 0.58 in (1993) |
| July 17 | 106.0°F (1901) | 55.9°F (1904) | 1.92 in (1951) |
| July 18 | 100.0°F (1988) | 53.1°F (1976) | 0.70 in (2025) |
| July 19 | 102.9°F (2012) | 52.0°F (1984) | 1.79 in (1948) |
| July 20 | 104.0°F (1901) | 59.0°F (2000) | 2.45 in (1935) |
| July 21 | 111.0°F (1901) | 55.0°F (2007) | 2.29 in (2025) |
| July 22 | 109.9°F (1901) | 55.9°F (2000) | 1.50 in (1994) |
| July 23 | 102.0°F (1983) | 52.0°F (1985) | 2.63 in (1951) |
| July 24 | 102.9°F (2012) | 54.0°F (1905) | 0.97 in (1978) |
| July 25 | 102.9°F (2012) | 54.0°F (1905) | 1.60 in (1900) |
| July 26 | 104.0°F (2012) | 54.0°F (1977) | 1.64 in (1948) |
| July 27 | 100.9°F (1901) | 53.1°F (1977) | 1.68 in (1934) |
| July 28 | 104.0°F (1901) | 51.1°F (1904) | 0.70 in (1938) |
| July 29 | 100.0°F (1983) | 53.1°F (1904) | 0.40 in (1976) |
| July 30 | 98.1°F (1983) | 54.0°F (1984) | 1.62 in (1901) |
| July 31 | 99.0°F (1999) | 54.0°F (1997) | 1.93 in (1976) |