August weather in Castalia, IA
The average temperature in Castalia in August is 69.5°F (58.2°F–80.8°F). Average precipitation: 4.36 inches.
August is a summer month in Castalia, and is warmer than the annual average of 46°F. Daily temperatures swing about 22.6°F between overnight low and afternoon high. Expect about 9 days with precipitation. Daylight averages about 13h 46m. For travel, August is a comfortable month to visit.
Avg High
80.8°F
Avg Low
58.2°F
Precipitation
4.36 in
Daylight
13h 46m
August records in Castalia
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| August 1 | 99.0°F (1988) | 48.9°F (1920) | 2.50 in (1921) |
| August 2 | 98.1°F (1988) | 43.0°F (1927) | 2.97 in (1928) |
| August 3 | 98.1°F (1988) | 46.0°F (1912) | 1.28 in (1903) |
| August 4 | 93.0°F (1989) | 44.1°F (1912) | 1.64 in (2002) |
| August 5 | 91.9°F (1918) | 43.0°F (1990) | 2.09 in (1938) |
| August 6 | 93.0°F (1937) | 46.0°F (1990) | 1.90 in (1907) |
| August 7 | 95.0°F (1937) | 46.0°F (2002) | 3.20 in (1925) |
| August 8 | 97.0°F (1934) | 45.0°F (1904) | 2.35 in (2009) |
| August 9 | 98.1°F (1936) | 39.9°F (1927) | 1.52 in (2021) |
| August 10 | 93.9°F (1944) | 43.0°F (1927) | 1.53 in (1998) |
| August 11 | 93.9°F (1941) | 46.0°F (1930) | 2.23 in (1921) |
| August 12 | 98.1°F (1936) | 45.0°F (1931) | 1.67 in (1943) |
| August 13 | 93.9°F (1901) | 44.1°F (2004) | 4.52 in (1943) |
| August 14 | 91.9°F (1988) | 41.0°F (1914) | 1.43 in (1909) |
| August 15 | 98.1°F (1936) | 43.0°F (2004) | 2.20 in (1993) |
| August 16 | 100.0°F (1937) | 45.0°F (1989) | 2.25 in (1918) |
| August 17 | 102.0°F (1988) | 46.0°F (1924) | 1.60 in (1913) |
| August 18 | 100.9°F (1936) | 41.0°F (2002) | 2.00 in (1999) |
| August 19 | 93.0°F (1901) | 42.1°F (2004) | 3.53 in (2007) |
| August 20 | 93.0°F (1901) | 41.0°F (2002) | 1.56 in (2007) |
| August 21 | 95.0°F (2023) | 39.0°F (2004) | 1.91 in (1936) |
| August 22 | 91.9°F (1936) | 37.9°F (1916) | 1.25 in (1988) |
| August 23 | 93.0°F (2023) | 36.0°F (1907) | 3.70 in (1899) |
| August 24 | 102.0°F (2023) | 37.9°F (1934) | 2.36 in (2016) |
| August 25 | 97.0°F (2023) | 32.0°F (1907) | 2.73 in (1990) |
| August 26 | 93.0°F (2020) | 37.9°F (1907) | 1.68 in (1992) |
| August 27 | 96.1°F (2024) | 39.9°F (1915) | 3.40 in (1903) |
| August 28 | 93.0°F (2020) | 39.0°F (1935) | 3.76 in (2021) |
| August 29 | 91.0°F (1945) | 35.1°F (1934) | 2.10 in (2015) |
| August 30 | 93.0°F (1937) | 36.0°F (1934) | 1.72 in (1921) |
| August 31 | 93.0°F (2012) | 39.9°F (2009) | 1.36 in (1923) |