August weather in Quincy, IL
The average temperature in Quincy in August is 75.7°F (65.7°F–85.6°F). Average precipitation: 3.33 inches.
August is a summer month in Quincy, and is warmer than the annual average of 53.7°F. Daily temperatures swing about 19.9°F between overnight low and afternoon high. Expect about 7 days with precipitation. Daylight averages about 13h 35m. For travel, August is a comfortable month to visit.
Avg High
85.6°F
Avg Low
65.7°F
Precipitation
3.33 in
Daylight
13h 35m
August records in Quincy
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| August 1 | 102.9°F (2006) | 54.0°F (1977) | 1.19 in (2024) |
| August 2 | 102.0°F (2006) | 54.0°F (1977) | 1.10 in (1956) |
| August 3 | 102.9°F (2006) | 55.9°F (1974) | 1.61 in (1972) |
| August 4 | 104.0°F (2011) | 50.0°F (1974) | 2.22 in (1968) |
| August 5 | 100.0°F (1988) | 52.0°F (1974) | 2.92 in (1970) |
| August 6 | 100.9°F (1938) | 51.1°F (1978) | 2.30 in (1940) |
| August 7 | 100.0°F (2006) | 52.0°F (1978) | 2.70 in (2007) |
| August 8 | 100.9°F (2012) | 52.0°F (1989) | 4.55 in (1943) |
| August 9 | 102.9°F (1988) | 52.0°F (1989) | 1.71 in (2021) |
| August 10 | 100.9°F (2001) | 44.1°F (1974) | 1.95 in (1992) |
| August 11 | 99.0°F (2010) | 53.1°F (1979) | 1.30 in (1939) |
| August 12 | 98.1°F (2007) | 52.0°F (1977) | 1.85 in (1939) |
| August 13 | 98.1°F (2007) | 48.9°F (1979) | 1.23 in (1963) |
| August 14 | 98.1°F (2010) | 51.1°F (2004) | 1.33 in (2010) |
| August 15 | 98.1°F (2007) | 51.1°F (2004) | 1.67 in (1977) |
| August 16 | 100.9°F (1988) | 51.1°F (2004) | 1.70 in (2014) |
| August 17 | 100.9°F (1988) | 53.1°F (1992) | 3.20 in (2014) |
| August 18 | 100.9°F (1983) | 52.0°F (1977) | 1.12 in (1960) |
| August 19 | 102.0°F (1988) | 52.0°F (1977) | 1.37 in (1963) |
| August 20 | 99.0°F (1983) | 51.1°F (1978) | 1.39 in (2009) |
| August 21 | 100.9°F (2003) | 51.1°F (1978) | 2.28 in (1969) |
| August 22 | 102.0°F (2003) | 55.0°F (1981) | 1.95 in (2017) |
| August 23 | 102.0°F (1947) | 51.1°F (1939) | 1.22 in (1988) |
| August 24 | 100.9°F (1943) | 51.1°F (1942) | 1.80 in (2018) |
| August 25 | 100.0°F (2023) | 53.1°F (2015) | 1.88 in (1964) |
| August 26 | 100.0°F (2023) | 53.1°F (1977) | 3.52 in (2004) |
| August 27 | 105.1°F (2003) | 52.0°F (2025) | 2.01 in (2016) |
| August 28 | 100.0°F (1983) | 50.0°F (2025) | 2.85 in (2004) |
| August 29 | 100.9°F (1984) | 50.0°F (1988) | 2.56 in (2018) |
| August 30 | 100.9°F (1947) | 48.0°F (1988) | 1.43 in (1955) |
| August 31 | 99.0°F (2013) | 48.0°F (1988) | 1.38 in (1993) |