May weather in San Marino, CA
The average temperature in San Marino in May is 66.1°F (53.9°F–78.3°F). Average precipitation: 0.48 inches.
May is a spring month in San Marino, and is warmer than the annual average of 66°F. Daily temperatures swing about 24.4°F between overnight low and afternoon high. Expect about 3 days with precipitation. Daylight averages about 13h 47m. For travel, May is one of the best months of the year to visit.
Avg High
78.3°F
Avg Low
53.9°F
Precipitation
0.48 in
Daylight
13h 47m
May records in San Marino
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| May 1 | 93.9°F (1996) | 32.0°F (1915) | 1.78 in (1955) |
| May 2 | 98.1°F (1947) | 39.9°F (1913) | 0.67 in (1915) |
| May 3 | 100.9°F (2004) | 39.9°F (1938) | 1.19 in (1930) |
| May 4 | 99.0°F (2004) | 39.9°F (1917) | 1.76 in (2023) |
| May 5 | 100.9°F (1990) | 37.0°F (1920) | 1.08 in (1998) |
| May 6 | 100.9°F (1990) | 39.9°F (1920) | 0.98 in (1921) |
| May 7 | 96.1°F (1941) | 39.0°F (1979) | 0.60 in (2016) |
| May 8 | 98.1°F (1923) | 37.0°F (1930) | 1.50 in (1977) |
| May 9 | 100.0°F (1923) | 37.9°F (1930) | 1.82 in (1977) |
| May 10 | 102.0°F (2025) | 35.1°F (1922) | 0.26 in (1980) |
| May 11 | 96.1°F (1934) | 37.9°F (1933) | 0.29 in (1957) |
| May 12 | 98.1°F (2013) | 42.1°F (1909) | 0.84 in (1998) |
| May 13 | 102.9°F (1927) | 42.1°F (1909) | 1.30 in (1998) |
| May 14 | 102.0°F (2014) | 41.0°F (1916) | 0.57 in (2015) |
| May 15 | 104.0°F (2014) | 43.0°F (1916) | 0.47 in (2015) |
| May 16 | 100.0°F (1967) | 39.9°F (1911) | 0.58 in (1962) |
| May 17 | 98.1°F (1920) | 41.0°F (1908) | 0.22 in (2019) |
| May 18 | 97.0°F (2008) | 41.0°F (1893) | 0.45 in (1917) |
| May 19 | 95.0°F (1942) | 41.0°F (1918) | 0.69 in (1949) |
| May 20 | 102.0°F (1942) | 41.0°F (1917) | 0.74 in (1921) |
| May 21 | 99.0°F (2000) | 41.0°F (1927) | 1.64 in (1921) |
| May 22 | 93.9°F (1988) | 39.0°F (1933) | 1.18 in (1921) |
| May 23 | 95.0°F (1949) | 42.1°F (1912) | 0.52 in (2008) |
| May 24 | 93.0°F (2001) | 39.0°F (1916) | 0.15 in (1931) |
| May 25 | 97.0°F (1974) | 37.0°F (1916) | 0.72 in (1931) |
| May 26 | 95.0°F (1968) | 37.0°F (1917) | 0.65 in (1906) |
| May 27 | 99.0°F (2000) | 41.0°F (1917) | 0.38 in (1947) |
| May 28 | 100.9°F (1973) | 41.0°F (1917) | 1.45 in (1990) |
| May 29 | 100.9°F (1984) | 42.1°F (1893) | 0.04 in (1937) |
| May 30 | 98.1°F (2025) | 44.1°F (1893) | 0.07 in (1955) |
| May 31 | 102.9°F (1909) | 41.0°F (1908) | 0.11 in (1967) |