August weather in Castalia, OH
The average temperature in Castalia in August is 73.2°F (65.8°F–80.5°F). Average precipitation: 3.02 inches.
August is a summer month in Castalia, and is warmer than the annual average of 52°F. Daily temperatures swing about 14.7°F between overnight low and afternoon high. Expect about 10 days with precipitation. Daylight averages about 13h 40m. For travel, August is a comfortable month to visit.
Avg High
80.5°F
Avg Low
65.8°F
Precipitation
3.02 in
Daylight
13h 40m
August records in Castalia
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| August 1 | 98.1°F (1999) | 55.0°F (1960) | 0.85 in (2013) |
| August 2 | 93.9°F (1955) | 55.0°F (1992) | 1.15 in (2024) |
| August 3 | 96.1°F (1944) | 55.9°F (1950) | 2.06 in (1967) |
| August 4 | 96.1°F (1944) | 54.0°F (1950) | 0.94 in (1953) |
| August 5 | 96.1°F (1955) | 50.0°F (1978) | 1.44 in (1956) |
| August 6 | 97.0°F (1947) | 52.0°F (1972) | 2.06 in (1955) |
| August 7 | 93.0°F (1968) | 54.0°F (1992) | 3.10 in (1972) |
| August 8 | 93.9°F (1941) | 53.1°F (1990) | 1.18 in (1939) |
| August 9 | 93.0°F (1949) | 50.0°F (1976) | 1.70 in (1968) |
| August 10 | 98.1°F (1944) | 52.0°F (1972) | 0.96 in (2012) |
| August 11 | 98.1°F (1944) | 54.0°F (1972) | 1.16 in (1980) |
| August 12 | 99.0°F (2005) | 53.1°F (1968) | 0.86 in (1980) |
| August 13 | 93.0°F (2002) | 53.1°F (1946) | 1.29 in (1943) |
| August 14 | 96.1°F (1944) | 53.1°F (1941) | 2.72 in (1954) |
| August 15 | 95.0°F (1944) | 52.0°F (1962) | 2.25 in (1973) |
| August 16 | 95.0°F (1936) | 52.0°F (1967) | 2.14 in (1975) |
| August 17 | 95.0°F (1937) | 54.0°F (1992) | 2.15 in (2018) |
| August 18 | 97.0°F (1988) | 51.1°F (1962) | 1.51 in (1956) |
| August 19 | 96.1°F (1936) | 52.0°F (1943) | 1.18 in (2007) |
| August 20 | 96.1°F (1937) | 53.1°F (1998) | 1.50 in (2007) |
| August 21 | 97.0°F (1955) | 50.0°F (1950) | 0.84 in (1937) |
| August 22 | 102.0°F (1936) | 52.0°F (1988) | 1.66 in (2019) |
| August 23 | 97.0°F (1936) | 53.1°F (1973) | 0.63 in (1970) |
| August 24 | 93.9°F (1954) | 51.1°F (1946) | 1.51 in (2011) |
| August 25 | 95.0°F (1959) | 48.9°F (1942) | 1.35 in (1947) |
| August 26 | 95.0°F (1959) | 50.0°F (1958) | 1.41 in (2018) |
| August 27 | 95.0°F (1959) | 50.0°F (1977) | 1.72 in (2012) |
| August 28 | 95.0°F (1953) | 50.0°F (1941) | 1.29 in (1974) |
| August 29 | 97.0°F (1953) | 46.0°F (1986) | 0.76 in (1979) |
| August 30 | 98.1°F (1953) | 45.0°F (1946) | 3.89 in (2005) |
| August 31 | 99.0°F (1951) | 46.0°F (1986) | 1.22 in (1950) |