May weather in San Mateo, CA
The average temperature in San Mateo in May is 59.9°F (51.6°F–68.3°F). Average precipitation: 0.48 inches.
May is a spring month in San Mateo, and is warmer than the annual average of 58.7°F. Daily temperatures swing about 16.7°F between overnight low and afternoon high. Expect about 3 days with precipitation. Daylight averages about 14h 1m. For travel, May is one of the best months of the year to visit.
Avg High
68.3°F
Avg Low
51.6°F
Precipitation
0.48 in
Daylight
14h 1m
May records in San Mateo
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| May 1 | 89.1°F (1947) | 44.1°F (1946) | 0.20 in (2009) |
| May 2 | 89.1°F (2013) | 42.1°F (1950) | 0.48 in (2023) |
| May 3 | 87.1°F (2017) | 39.0°F (1950) | 0.44 in (1951) |
| May 4 | 84.0°F (2011) | 39.9°F (1950) | 0.95 in (2024) |
| May 5 | 91.0°F (1987) | 41.0°F (1965) | 0.24 in (1983) |
| May 6 | 87.1°F (1949) | 41.0°F (1968) | 0.66 in (1994) |
| May 7 | 89.1°F (2007) | 39.9°F (1968) | 0.44 in (1994) |
| May 8 | 86.0°F (2001) | 44.1°F (1952) | 0.30 in (1963) |
| May 9 | 88.0°F (1993) | 41.0°F (1950) | 0.20 in (1980) |
| May 10 | 84.0°F (2006) | 43.0°F (1953) | 0.20 in (1963) |
| May 11 | 84.9°F (1959) | 42.1°F (1953) | 0.11 in (1958) |
| May 12 | 96.1°F (1976) | 42.1°F (1953) | 0.40 in (1998) |
| May 13 | 91.9°F (2014) | 45.0°F (1956) | 0.32 in (1995) |
| May 14 | 91.0°F (2014) | 41.0°F (1968) | 0.33 in (1995) |
| May 15 | 96.1°F (2008) | 43.0°F (1955) | 1.03 in (1996) |
| May 16 | 93.0°F (1956) | 44.1°F (1955) | 0.29 in (2019) |
| May 17 | 93.0°F (1997) | 45.0°F (1966) | 0.24 in (1994) |
| May 18 | 84.9°F (1978) | 42.1°F (1950) | 1.23 in (1957) |
| May 19 | 86.0°F (1952) | 42.1°F (1950) | 0.30 in (1961) |
| May 20 | 93.0°F (1988) | 45.0°F (1950) | 1.53 in (1957) |
| May 21 | 91.9°F (2000) | 45.0°F (1962) | 0.24 in (2006) |
| May 22 | 82.9°F (1954) | 44.1°F (1952) | 0.20 in (1958) |
| May 23 | 88.0°F (1982) | 46.0°F (1954) | 0.21 in (1997) |
| May 24 | 91.0°F (1982) | 45.0°F (1953) | 0.14 in (1960) |
| May 25 | 90.0°F (2020) | 45.0°F (1953) | 0.12 in (1946) |
| May 26 | 89.1°F (1974) | 42.1°F (1953) | 0.12 in (1947) |
| May 27 | 97.0°F (1984) | 42.1°F (1954) | 0.92 in (1990) |
| May 28 | 91.9°F (1984) | 45.0°F (1954) | 0.41 in (1998) |
| May 29 | 93.9°F (1975) | 45.0°F (1946) | 0.16 in (1998) |
| May 30 | 95.0°F (2001) | 46.0°F (1974) | 0.28 in (1990) |
| May 31 | 91.0°F (2001) | 46.0°F (1962) | 0.11 in (1947) |