August weather in San Mateo, CA
The average temperature in San Mateo in August is 64.9°F (56.4°F–73.4°F). Average precipitation: 0.04 inches.
August is a summer month in San Mateo, and is warmer than the annual average of 58.7°F. Daily temperatures swing about 17°F between overnight low and afternoon high. Expect about 0 days with precipitation. Daylight averages about 13h 27m. For travel, August is one of the best months of the year to visit.
Avg High
73.4°F
Avg Low
56.4°F
Precipitation
0.04 in
Daylight
13h 27m
August records in San Mateo
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| August 1 | 100.0°F (1993) | 48.0°F (1951) | 0.01 in (2022) |
| August 2 | 91.0°F (1946) | 48.9°F (1945) | 0.00 in (1945) |
| August 3 | 91.0°F (1998) | 45.0°F (1954) | 0.01 in (1953) |
| August 4 | 87.1°F (1998) | 50.0°F (1945) | 0.00 in (1945) |
| August 5 | 89.1°F (1964) | 48.9°F (1950) | 0.01 in (2008) |
| August 6 | 93.0°F (1982) | 46.0°F (1950) | 0.01 in (1999) |
| August 7 | 93.9°F (1984) | 46.0°F (1950) | 0.00 in (1945) |
| August 8 | 89.1°F (2002) | 46.9°F (1946) | 0.01 in (1962) |
| August 9 | 95.0°F (1970) | 48.0°F (1954) | 0.02 in (1962) |
| August 10 | 87.1°F (2009) | 46.9°F (1951) | 0.00 in (1945) |
| August 11 | 84.0°F (1959) | 48.0°F (1946) | 0.29 in (1965) |
| August 12 | 89.1°F (1958) | 46.9°F (1946) | 0.00 in (1945) |
| August 13 | 89.1°F (1991) | 46.9°F (1946) | 0.18 in (1991) |
| August 14 | 99.0°F (2020) | 46.9°F (1946) | 0.13 in (1976) |
| August 15 | 93.9°F (2019) | 46.0°F (1955) | 0.13 in (1976) |
| August 16 | 90.0°F (2015) | 48.0°F (1952) | 0.04 in (2020) |
| August 17 | 82.0°F (1988) | 48.0°F (1945) | 0.03 in (1976) |
| August 18 | 84.9°F (1978) | 48.0°F (1957) | 0.35 in (1976) |
| August 19 | 89.1°F (1964) | 48.9°F (1955) | 0.56 in (1997) |
| August 20 | 89.1°F (2023) | 46.9°F (1955) | 0.04 in (1997) |
| August 21 | 84.9°F (1974) | 48.0°F (1952) | 0.04 in (1968) |
| August 22 | 90.0°F (1999) | 48.9°F (1955) | 0.02 in (1951) |
| August 23 | 91.9°F (2010) | 48.9°F (1953) | 0.00 in (1945) |
| August 24 | 99.0°F (2010) | 48.9°F (1955) | 0.10 in (2024) |
| August 25 | 93.0°F (1988) | 50.0°F (1955) | 0.01 in (1954) |
| August 26 | 89.1°F (1993) | 48.0°F (1945) | 0.01 in (1961) |
| August 27 | 93.9°F (1993) | 46.0°F (1951) | 0.08 in (1949) |
| August 28 | 95.0°F (2009) | 48.9°F (1945) | 0.00 in (1945) |
| August 29 | 98.1°F (1968) | 48.9°F (1955) | 0.14 in (1992) |
| August 30 | 91.0°F (2023) | 45.0°F (1952) | 0.11 in (1984) |
| August 31 | 89.1°F (2005) | 48.0°F (1955) | 0.01 in (1964) |