August weather in Decorah, IA
The average temperature in Decorah in August is 71.7°F (60.7°F–82.7°F). Average precipitation: 4.39 inches.
August is a summer month in Decorah, and is warmer than the annual average of 48.5°F. Daily temperatures swing about 22°F between overnight low and afternoon high. Expect about 10 days with precipitation. Daylight averages about 13h 47m. For travel, August is a comfortable month to visit.
Avg High
82.7°F
Avg Low
60.7°F
Precipitation
4.39 in
Daylight
13h 47m
August records in Decorah
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| August 1 | 100.0°F (1988) | 39.9°F (1927) | 2.73 in (1972) |
| August 2 | 100.9°F (1964) | 39.9°F (1927) | 2.63 in (1953) |
| August 3 | 100.9°F (1930) | 39.9°F (1894) | 1.95 in (1953) |
| August 4 | 98.1°F (1896) | 42.1°F (1912) | 2.05 in (1924) |
| August 5 | 97.0°F (1909) | 42.1°F (1994) | 2.36 in (1961) |
| August 6 | 100.9°F (1931) | 44.1°F (1957) | 3.64 in (1951) |
| August 7 | 102.0°F (1894) | 46.0°F (1993) | 1.71 in (2022) |
| August 8 | 102.0°F (1894) | 39.0°F (1904) | 2.74 in (1988) |
| August 9 | 100.9°F (1936) | 36.0°F (1927) | 1.75 in (1908) |
| August 10 | 97.0°F (1900) | 41.0°F (1927) | 2.10 in (1985) |
| August 11 | 98.1°F (1923) | 41.0°F (1930) | 1.18 in (1974) |
| August 12 | 100.9°F (1936) | 42.1°F (1931) | 3.50 in (1906) |
| August 13 | 97.0°F (1900) | 45.0°F (1931) | 3.26 in (1911) |
| August 14 | 97.0°F (1900) | 36.0°F (1964) | 1.34 in (1903) |
| August 15 | 102.9°F (1936) | 37.0°F (1929) | 3.43 in (1993) |
| August 16 | 104.0°F (1937) | 41.0°F (1992) | 2.43 in (1918) |
| August 17 | 100.0°F (1988) | 42.1°F (1962) | 2.90 in (2025) |
| August 18 | 102.0°F (1936) | 43.0°F (1963) | 8.64 in (2025) |
| August 19 | 97.0°F (1916) | 39.9°F (1929) | 3.21 in (2007) |
| August 20 | 97.0°F (1916) | 37.0°F (1950) | 3.25 in (1907) |
| August 21 | 104.0°F (1955) | 37.9°F (2004) | 2.49 in (1939) |
| August 22 | 97.0°F (1916) | 39.9°F (1923) | 2.21 in (1959) |
| August 23 | 105.1°F (2023) | 41.0°F (1920) | 4.46 in (1928) |
| August 24 | 105.1°F (2023) | 35.1°F (1927) | 8.06 in (2016) |
| August 25 | 99.0°F (1948) | 35.1°F (1958) | 3.34 in (1983) |
| August 26 | 97.0°F (2024) | 37.0°F (1934) | 2.28 in (1932) |
| August 27 | 98.1°F (2024) | 39.0°F (1896) | 2.83 in (2021) |
| August 28 | 98.1°F (1955) | 39.0°F (1935) | 2.95 in (2018) |
| August 29 | 95.0°F (1948) | 33.1°F (1934) | 2.11 in (1995) |
| August 30 | 96.1°F (1937) | 32.0°F (1915) | 2.82 in (1948) |
| August 31 | 97.0°F (1937) | 32.0°F (1915) | 3.62 in (1962) |