August weather in Monmouth, IL
The average temperature in Monmouth in August is 72.2°F (61.5°F–82.8°F). Average precipitation: 3.92 inches.
August is a summer month in Monmouth, and is warmer than the annual average of 50.6°F. Daily temperatures swing about 21.3°F between overnight low and afternoon high. Expect about 8 days with precipitation. Daylight averages about 13h 38m. For travel, August is a comfortable month to visit.
Avg High
82.8°F
Avg Low
61.5°F
Precipitation
3.92 in
Daylight
13h 38m
August records in Monmouth
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| August 1 | 102.9°F (1988) | 50.0°F (1908) | 1.43 in (1919) |
| August 2 | 100.0°F (1930) | 48.0°F (1985) | 1.88 in (1921) |
| August 3 | 104.0°F (1930) | 39.9°F (1912) | 1.91 in (1971) |
| August 4 | 102.0°F (1918) | 44.1°F (1894) | 1.35 in (1968) |
| August 5 | 102.9°F (1918) | 46.9°F (1894) | 2.07 in (2023) |
| August 6 | 102.9°F (1918) | 48.0°F (1901) | 2.77 in (1963) |
| August 7 | 99.0°F (1918) | 46.9°F (1989) | 2.62 in (1982) |
| August 8 | 102.9°F (1913) | 44.1°F (1904) | 3.22 in (1977) |
| August 9 | 102.9°F (1894) | 46.0°F (1922) | 4.57 in (1998) |
| August 10 | 99.0°F (1944) | 48.9°F (1978) | 3.42 in (1993) |
| August 11 | 100.0°F (1941) | 46.9°F (1902) | 2.65 in (1952) |
| August 12 | 102.0°F (1918) | 44.1°F (1902) | 1.38 in (2016) |
| August 13 | 104.0°F (1936) | 46.9°F (1964) | 1.44 in (1921) |
| August 14 | 105.1°F (1909) | 46.0°F (2004) | 1.58 in (1980) |
| August 15 | 104.0°F (1909) | 45.0°F (1979) | 3.35 in (1896) |
| August 16 | 102.0°F (1909) | 43.0°F (1997) | 4.90 in (1898) |
| August 17 | 104.0°F (1988) | 50.0°F (1899) | 2.86 in (1997) |
| August 18 | 105.1°F (1936) | 45.0°F (1963) | 1.54 in (1902) |
| August 19 | 100.0°F (1936) | 48.0°F (1895) | 2.02 in (1904) |
| August 20 | 100.9°F (1983) | 39.9°F (1897) | 1.65 in (1935) |
| August 21 | 100.0°F (1936) | 45.0°F (1950) | 0.84 in (1964) |
| August 22 | 100.9°F (1936) | 44.1°F (1923) | 1.68 in (1970) |
| August 23 | 100.9°F (1909) | 46.0°F (1902) | 2.66 in (1989) |
| August 24 | 102.9°F (1909) | 44.1°F (1942) | 2.31 in (1924) |
| August 25 | 100.0°F (1936) | 44.1°F (1917) | 1.50 in (1943) |
| August 26 | 98.1°F (2003) | 44.1°F (1910) | 1.86 in (1965) |
| August 27 | 102.9°F (1909) | 44.1°F (1910) | 3.03 in (1903) |
| August 28 | 96.1°F (1897) | 41.0°F (1915) | 1.49 in (1977) |
| August 29 | 97.0°F (1925) | 42.1°F (1934) | 2.25 in (1955) |
| August 30 | 99.0°F (1953) | 39.9°F (1915) | 3.93 in (1965) |
| August 31 | 100.9°F (1953) | 37.9°F (1915) | 2.84 in (1980) |