August weather in Half Moon Bay, CA
The average temperature in Half Moon Bay in August is 59.7°F (53.9°F–65.6°F). Average precipitation: 0.23 inches.
August is a summer month in Half Moon Bay, and is warmer than the annual average of 54.9°F. Daily temperatures swing about 11.7°F between overnight low and afternoon high. Expect about 8 days with precipitation. Daylight averages about 13h 27m. For travel, August is one of the best months of the year to visit.
Avg High
65.6°F
Avg Low
53.9°F
Precipitation
0.23 in
Daylight
13h 27m
August records in Half Moon Bay
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| August 1 | 84.0°F (1990) | 44.1°F (1970) | 0.06 in (2025) |
| August 2 | 75.9°F (2015) | 43.0°F (1956) | 0.14 in (1953) |
| August 3 | 75.0°F (2015) | 45.0°F (1970) | 0.08 in (1957) |
| August 4 | 75.0°F (2015) | 45.0°F (1969) | 0.13 in (2011) |
| August 5 | 73.9°F (2015) | 44.1°F (1970) | 0.13 in (1991) |
| August 6 | 71.1°F (1949) | 44.1°F (1944) | 0.09 in (2009) |
| August 7 | 73.0°F (1961) | 42.1°F (1944) | 0.07 in (1956) |
| August 8 | 82.9°F (2004) | 41.0°F (1975) | 0.08 in (1962) |
| August 9 | 73.0°F (1941) | 41.0°F (1975) | 0.06 in (1956) |
| August 10 | 75.0°F (1970) | 43.0°F (1956) | 0.16 in (1984) |
| August 11 | 71.1°F (2001) | 44.1°F (2008) | 0.23 in (1965) |
| August 12 | 73.0°F (2015) | 44.1°F (1985) | 0.22 in (1991) |
| August 13 | 91.0°F (1991) | 43.0°F (2007) | 0.10 in (1981) |
| August 14 | 82.0°F (2020) | 43.0°F (1951) | 0.13 in (1991) |
| August 15 | 88.0°F (2015) | 43.0°F (1951) | 0.60 in (1976) |
| August 16 | 82.0°F (2020) | 44.1°F (1991) | 0.13 in (2025) |
| August 17 | 72.0°F (2015) | 43.0°F (2000) | 0.07 in (1975) |
| August 18 | 73.9°F (2002) | 46.9°F (1952) | 0.50 in (1976) |
| August 19 | 72.0°F (2015) | 44.1°F (1955) | 0.22 in (1976) |
| August 20 | 73.0°F (1940) | 45.0°F (1952) | 0.72 in (1997) |
| August 21 | 73.9°F (1983) | 45.0°F (1945) | 0.08 in (1971) |
| August 22 | 75.0°F (1976) | 46.0°F (1954) | 0.18 in (1989) |
| August 23 | 77.0°F (1959) | 44.1°F (2010) | 0.10 in (1959) |
| August 24 | 77.0°F (1959) | 44.1°F (1970) | 0.19 in (1977) |
| August 25 | 81.0°F (2010) | 46.0°F (1968) | 0.08 in (1977) |
| August 26 | 77.0°F (1999) | 43.0°F (1944) | 0.22 in (1954) |
| August 27 | 73.0°F (1968) | 41.0°F (1981) | 0.10 in (1961) |
| August 28 | 86.0°F (1962) | 43.0°F (1992) | 0.07 in (1974) |
| August 29 | 93.9°F (1968) | 45.0°F (1939) | 0.06 in (1990) |
| August 30 | 88.0°F (1968) | 42.1°F (1955) | 0.15 in (1984) |
| August 31 | 82.0°F (1947) | 43.0°F (2005) | 0.09 in (1973) |