August weather in San Rafael, CA
The average temperature in San Rafael in August is 68.4°F (55.5°F–81.3°F). Average precipitation: 0.05 inches.
August is a summer month in San Rafael, and is warmer than the annual average of 59.5°F. Daily temperatures swing about 25.8°F between overnight low and afternoon high. Expect about 0 days with precipitation. Daylight averages about 13h 28m. For travel, August is a comfortable month to visit.
Avg High
81.3°F
Avg Low
55.5°F
Precipitation
0.05 in
Daylight
13h 28m
August records in San Rafael
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| August 1 | 100.9°F (1993) | 45.0°F (1996) | 0.00 in (1903) |
| August 2 | 99.0°F (1998) | 46.0°F (1903) | 0.00 in (1903) |
| August 3 | 105.1°F (1998) | 44.1°F (1903) | 0.00 in (1903) |
| August 4 | 104.0°F (1998) | 43.0°F (1903) | 0.00 in (1903) |
| August 5 | 98.1°F (1997) | 46.9°F (1950) | 0.00 in (1903) |
| August 6 | 99.0°F (1990) | 41.0°F (1996) | 0.00 in (1903) |
| August 7 | 97.0°F (1978) | 46.9°F (1954) | 0.00 in (1903) |
| August 8 | 99.0°F (1984) | 43.0°F (1904) | 0.04 in (1959) |
| August 9 | 99.0°F (2002) | 46.9°F (1955) | 0.00 in (1903) |
| August 10 | 98.1°F (1984) | 48.0°F (1950) | 0.00 in (1903) |
| August 11 | 97.0°F (1996) | 44.1°F (1992) | 0.75 in (1965) |
| August 12 | 99.0°F (1959) | 45.0°F (1903) | 0.02 in (1965) |
| August 13 | 98.1°F (1996) | 46.0°F (1903) | 0.29 in (1991) |
| August 14 | 93.0°F (1994) | 46.9°F (1955) | 0.05 in (1976) |
| August 15 | 98.1°F (1950) | 46.0°F (1955) | 0.00 in (1903) |
| August 16 | 100.9°F (2015) | 46.9°F (1955) | 0.53 in (1976) |
| August 17 | 93.9°F (1960) | 48.0°F (1992) | 0.02 in (1976) |
| August 18 | 95.0°F (2013) | 46.9°F (1963) | 0.13 in (1976) |
| August 19 | 96.1°F (1964) | 46.0°F (1973) | 0.50 in (1997) |
| August 20 | 98.1°F (2025) | 46.0°F (1903) | 0.57 in (1997) |
| August 21 | 100.0°F (2025) | 46.0°F (1955) | 0.06 in (1968) |
| August 22 | 96.1°F (1999) | 45.0°F (1955) | 0.03 in (1968) |
| August 23 | 97.0°F (2010) | 46.0°F (1904) | 0.00 in (1903) |
| August 24 | 102.0°F (2010) | 45.0°F (1955) | 0.00 in (1903) |
| August 25 | 100.0°F (1988) | 45.0°F (1955) | 0.00 in (1903) |
| August 26 | 99.0°F (2017) | 45.0°F (1955) | 0.11 in (1954) |
| August 27 | 100.9°F (2024) | 39.9°F (1992) | 0.07 in (1954) |
| August 28 | 100.9°F (2021) | 45.0°F (1955) | 0.09 in (1954) |
| August 29 | 99.0°F (1968) | 45.0°F (1904) | 0.10 in (1953) |
| August 30 | 100.0°F (1968) | 45.0°F (1952) | 0.06 in (1966) |
| August 31 | 100.0°F (2025) | 46.0°F (1903) | 0.05 in (1966) |