August weather in Collinsville, IL
The average temperature in Collinsville in August is °F (°F–°F). Average precipitation: 4.02 inches.
August is a summer month in Collinsville, and is cooler than the annual average of 0°F. Expect about 9 days with precipitation. Daylight averages about 13h 31m.
Avg High
°F
Avg Low
°F
Precipitation
4.02 in
Daylight
13h 31m
August records in Collinsville
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| August 1 | 100.9°F (1987) | 78.1°F (1987) | 1.61 in (1932) |
| August 2 | 102.9°F (1987) | 79.0°F (1987) | 1.63 in (1995) |
| August 3 | 102.0°F (1987) | 75.0°F (1987) | 2.31 in (1946) |
| August 4 | 82.9°F (1987) | 70.0°F (1987) | 1.83 in (1972) |
| August 5 | 86.0°F (1987) | 66.9°F (1987) | 1.88 in (1998) |
| August 6 | 89.1°F (1987) | 68.0°F (1987) | 1.67 in (2015) |
| August 7 | 93.9°F (1987) | 71.1°F (1987) | 1.77 in (1995) |
| August 8 | 90.0°F (1987) | 68.0°F (1987) | 1.90 in (2014) |
| August 9 | 82.9°F (1987) | 66.0°F (1987) | 1.86 in (1977) |
| August 10 | 84.0°F (1987) | 66.9°F (1987) | 4.57 in (1961) |
| August 11 | 89.1°F (1987) | 64.9°F (1987) | 1.73 in (2025) |
| August 12 | 87.1°F (1987) | 66.9°F (1987) | 3.77 in (2019) |
| August 13 | 87.1°F (1987) | 66.9°F (1987) | 2.05 in (1916) |
| August 14 | 93.0°F (1987) | 68.0°F (1987) | 1.98 in (2010) |
| August 15 | 91.9°F (1987) | 75.0°F (1987) | 3.97 in (1946) |
| August 16 | 97.0°F (1987) | 78.1°F (1987) | 5.86 in (1946) |
| August 17 | 93.9°F (1987) | 79.0°F (1987) | 1.70 in (2009) |
| August 18 | 87.1°F (1987) | 72.0°F (1987) | 3.62 in (1939) |
| August 19 | 86.0°F (1987) | 63.0°F (1987) | 2.43 in (1967) |
| August 20 | 93.9°F (1987) | 66.0°F (1987) | 7.05 in (1915) |
| August 21 | 100.9°F (1987) | 70.0°F (1987) | 3.00 in (1979) |
| August 22 | 91.0°F (1987) | 70.0°F (1987) | 1.16 in (1944) |
| August 23 | 73.9°F (1987) | 59.0°F (1987) | 1.72 in (1983) |
| August 24 | 77.0°F (1987) | 54.0°F (1987) | 4.63 in (1977) |
| August 25 | 81.0°F (1987) | 57.0°F (1987) | 2.36 in (1914) |
| August 26 | 97.0°F (1987) | 69.1°F (1987) | 1.98 in (1975) |
| August 27 | 73.9°F (1987) | 62.1°F (1987) | 1.33 in (1997) |
| August 28 | 80.1°F (1987) | 60.1°F (1987) | 2.00 in (1974) |
| August 29 | 82.9°F (1987) | 55.0°F (1987) | 0.48 in (1977) |
| August 30 | 87.1°F (1987) | 57.0°F (1987) | 1.61 in (1950) |
| August 31 | 78.1°F (1987) | 57.9°F (1987) | 1.86 in (1926) |