August weather in Black Diamond, WA
The average temperature in Black Diamond in August is 64.4°F (51.5°F–77.3°F). Average precipitation: 1.64 inches.
August is a summer month in Black Diamond, and is warmer than the annual average of 50.5°F. Daily temperatures swing about 25.8°F between overnight low and afternoon high. Expect about 7 days with precipitation. Daylight averages about 14h 3m. For travel, August is one of the best months of the year to visit.
Avg High
77.3°F
Avg Low
51.5°F
Precipitation
1.64 in
Daylight
14h 3m
August records in Black Diamond
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| August 1 | 95.0°F (2015) | 39.0°F (1939) | 0.52 in (1964) |
| August 2 | 93.9°F (2017) | 39.0°F (1926) | 0.66 in (1996) |
| August 3 | 93.9°F (1952) | 37.9°F (1956) | 0.76 in (1962) |
| August 4 | 97.0°F (2005) | 39.0°F (1956) | 0.86 in (1962) |
| August 5 | 91.9°F (1945) | 39.9°F (1929) | 1.53 in (1933) |
| August 6 | 91.9°F (1972) | 39.9°F (1939) | 0.78 in (2004) |
| August 7 | 93.9°F (1972) | 39.9°F (1950) | 1.31 in (1976) |
| August 8 | 99.0°F (1960) | 37.0°F (1938) | 1.27 in (1912) |
| August 9 | 102.0°F (1981) | 37.0°F (1938) | 0.40 in (2008) |
| August 10 | 100.0°F (1981) | 37.9°F (1954) | 0.67 in (1922) |
| August 11 | 98.1°F (2014) | 39.9°F (1931) | 1.06 in (1983) |
| August 12 | 97.0°F (2021) | 39.9°F (1958) | 0.76 in (2009) |
| August 13 | 97.0°F (2021) | 37.0°F (1955) | 1.16 in (2014) |
| August 14 | 99.0°F (2023) | 36.0°F (1926) | 2.18 in (1968) |
| August 15 | 98.1°F (1942) | 37.0°F (1928) | 2.02 in (1950) |
| August 16 | 97.0°F (2020) | 36.0°F (1935) | 1.52 in (1912) |
| August 17 | 97.0°F (1977) | 35.1°F (1935) | 0.91 in (1995) |
| August 18 | 91.9°F (2022) | 35.1°F (1973) | 1.33 in (1975) |
| August 19 | 96.1°F (2016) | 34.0°F (1945) | 1.28 in (1924) |
| August 20 | 93.9°F (1920) | 32.0°F (1941) | 1.00 in (2008) |
| August 21 | 93.0°F (2018) | 33.1°F (1930) | 1.51 in (1990) |
| August 22 | 91.9°F (2022) | 36.0°F (1973) | 1.72 in (2001) |
| August 23 | 91.9°F (2022) | 37.0°F (1973) | 1.37 in (2024) |
| August 24 | 91.9°F (1934) | 37.9°F (1929) | 2.23 in (2004) |
| August 25 | 93.9°F (1934) | 28.9°F (1925) | 0.87 in (1945) |
| August 26 | 93.0°F (1986) | 37.9°F (1957) | 2.76 in (2004) |
| August 27 | 90.0°F (2019) | 37.0°F (1957) | 0.72 in (1991) |
| August 28 | 97.0°F (1967) | 37.0°F (1957) | 1.66 in (1951) |
| August 29 | 91.9°F (1974) | 35.1°F (1959) | 1.28 in (2005) |
| August 30 | 97.0°F (1944) | 35.1°F (1959) | 1.57 in (2014) |
| August 31 | 93.9°F (2022) | 36.0°F (1941) | 1.28 in (1961) |