May weather in Half Moon Bay, CA
The average temperature in Half Moon Bay in May is 54.9°F (48.0°F–61.7°F). Average precipitation: 0.96 inches.
May is a spring month in Half Moon Bay, and is warmer than the annual average of 54.9°F. Daily temperatures swing about 13.7°F between overnight low and afternoon high. Expect about 7 days with precipitation. Daylight averages about 14h 1m. For travel, May is a comfortable month to visit.
Avg High
61.7°F
Avg Low
48.0°F
Precipitation
0.96 in
Daylight
14h 1m
May records in Half Moon Bay
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| May 1 | 81.0°F (1947) | 33.1°F (2008) | 0.42 in (1995) |
| May 2 | 84.9°F (2013) | 35.1°F (2008) | 0.43 in (1986) |
| May 3 | 81.0°F (1953) | 35.1°F (1991) | 0.82 in (2023) |
| May 4 | 82.0°F (2011) | 37.9°F (1950) | 1.26 in (2024) |
| May 5 | 77.0°F (1942) | 37.0°F (1949) | 0.60 in (2009) |
| May 6 | 82.0°F (1949) | 36.0°F (2010) | 0.81 in (1983) |
| May 7 | 78.1°F (1967) | 35.1°F (1950) | 0.66 in (1979) |
| May 8 | 84.9°F (2007) | 37.9°F (1999) | 0.82 in (2000) |
| May 9 | 84.0°F (1941) | 37.0°F (1999) | 0.63 in (2005) |
| May 10 | 88.0°F (1941) | 37.0°F (1991) | 0.21 in (1963) |
| May 11 | 73.9°F (1953) | 36.0°F (2022) | 0.53 in (1942) |
| May 12 | 71.1°F (1976) | 37.0°F (1943) | 0.51 in (1945) |
| May 13 | 73.9°F (2014) | 35.1°F (2008) | 0.49 in (1995) |
| May 14 | 82.9°F (1970) | 39.0°F (1968) | 0.27 in (1995) |
| May 15 | 90.0°F (1970) | 37.0°F (1964) | 0.90 in (1996) |
| May 16 | 96.1°F (2008) | 37.0°F (1943) | 0.88 in (1996) |
| May 17 | 82.9°F (1997) | 36.0°F (1991) | 0.64 in (1944) |
| May 18 | 75.0°F (2008) | 35.1°F (1991) | 0.80 in (1957) |
| May 19 | 82.0°F (1942) | 37.9°F (1950) | 1.07 in (1957) |
| May 20 | 84.0°F (1983) | 37.9°F (2009) | 0.26 in (1948) |
| May 21 | 80.1°F (1941) | 37.9°F (2022) | 0.60 in (1957) |
| May 22 | 79.0°F (1943) | 33.1°F (2008) | 0.40 in (1990) |
| May 23 | 78.1°F (1992) | 35.1°F (2008) | 0.44 in (1997) |
| May 24 | 81.0°F (1951) | 39.9°F (1966) | 0.41 in (1993) |
| May 25 | 82.9°F (1951) | 37.9°F (1955) | 0.65 in (1942) |
| May 26 | 78.1°F (1951) | 39.9°F (1966) | 0.53 in (1946) |
| May 27 | 72.0°F (1982) | 39.9°F (1954) | 1.28 in (1990) |
| May 28 | 70.0°F (1960) | 39.9°F (1966) | 1.28 in (1998) |
| May 29 | 90.0°F (1975) | 39.9°F (1966) | 0.40 in (1991) |
| May 30 | 66.9°F (1940) | 39.0°F (1991) | 0.23 in (1993) |
| May 31 | 77.0°F (1997) | 42.1°F (1991) | 0.26 in (2011) |