May weather in San Rafael, CA
The average temperature in San Rafael in May is 61.3°F (50.6°F–72.0°F). Average precipitation: 0.94 inches.
May is a spring month in San Rafael, and is warmer than the annual average of 59.5°F. Daily temperatures swing about 21.4°F between overnight low and afternoon high. Expect about 3 days with precipitation. Daylight averages about 14h 3m. For travel, May is one of the best months of the year to visit.
Avg High
72.0°F
Avg Low
50.6°F
Precipitation
0.94 in
Daylight
14h 3m
May records in San Rafael
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| May 1 | 91.0°F (2014) | 37.9°F (1976) | 0.78 in (2009) |
| May 2 | 91.0°F (1966) | 37.9°F (1976) | 0.88 in (2003) |
| May 3 | 91.9°F (2017) | 37.0°F (1976) | 0.72 in (2003) |
| May 4 | 91.0°F (1990) | 30.9°F (1965) | 0.81 in (2024) |
| May 5 | 90.0°F (1969) | 39.9°F (1973) | 0.60 in (1979) |
| May 6 | 96.1°F (1987) | 41.0°F (1968) | 1.26 in (1905) |
| May 7 | 95.0°F (1987) | 27.0°F (1993) | 0.53 in (1994) |
| May 8 | 96.1°F (1987) | 37.0°F (1980) | 1.26 in (2005) |
| May 9 | 90.0°F (1904) | 41.0°F (1895) | 0.45 in (1977) |
| May 10 | 91.9°F (2024) | 39.9°F (1993) | 0.16 in (2010) |
| May 11 | 89.1°F (1972) | 41.0°F (1978) | 0.11 in (1961) |
| May 12 | 100.0°F (1976) | 37.9°F (1962) | 1.39 in (1998) |
| May 13 | 100.0°F (1976) | 39.9°F (1894) | 0.72 in (2000) |
| May 14 | 93.9°F (1972) | 41.0°F (1961) | 0.70 in (1995) |
| May 15 | 97.0°F (2008) | 39.0°F (1966) | 1.85 in (1996) |
| May 16 | 99.0°F (2008) | 39.9°F (1894) | 0.45 in (1964) |
| May 17 | 98.1°F (1997) | 35.1°F (1976) | 0.53 in (1996) |
| May 18 | 93.0°F (1997) | 39.9°F (1996) | 2.00 in (1957) |
| May 19 | 95.0°F (1955) | 37.0°F (1976) | 1.03 in (1957) |
| May 20 | 96.1°F (1955) | 35.1°F (1894) | 0.84 in (1957) |
| May 21 | 98.1°F (2000) | 39.9°F (1895) | 0.34 in (1953) |
| May 22 | 95.0°F (2000) | 30.9°F (1976) | 0.25 in (1996) |
| May 23 | 93.0°F (1952) | 39.9°F (1894) | 0.36 in (1997) |
| May 24 | 91.9°F (1970) | 36.0°F (1980) | 0.44 in (1993) |
| May 25 | 97.0°F (1951) | 37.0°F (1894) | 0.63 in (1894) |
| May 26 | 98.1°F (1974) | 41.0°F (1894) | 0.45 in (1895) |
| May 27 | 98.1°F (1984) | 39.9°F (1977) | 1.99 in (1990) |
| May 28 | 96.1°F (1975) | 35.1°F (1894) | 1.36 in (1998) |
| May 29 | 100.0°F (1950) | 35.1°F (1894) | 0.18 in (1998) |
| May 30 | 99.0°F (2001) | 36.0°F (1894) | 0.33 in (1948) |
| May 31 | 98.1°F (2025) | 33.1°F (1894) | 0.42 in (1947) |