May weather in Portola, CA
The average temperature in Portola in May is 51.0°F (35.1°F–67.0°F). Average precipitation: 1.15 inches. Average snowfall is 0.2 inches.
May is a spring month in Portola, and is warmer than the annual average of 46.7°F. Daily temperatures swing about 31.9°F between overnight low and afternoon high. Expect about 6 days with precipitation. Daylight averages about 14h 12m. For travel, May is cool.
Avg High
67.0°F
Avg Low
35.1°F
Precipitation
1.15 in
Snow
0.2 in
May records in Portola
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| May 1 | 86.0°F (1947) | 16.0°F (1920) | 0.70 in (1950) |
| May 2 | 82.9°F (1947) | 17.1°F (1964) | 0.95 in (2009) |
| May 3 | 82.0°F (1925) | 12.9°F (1950) | 0.56 in (1971) |
| May 4 | 84.0°F (1925) | 19.9°F (1924) | 0.61 in (1960) |
| May 5 | 86.0°F (1925) | 21.0°F (1924) | 1.14 in (2024) |
| May 6 | 84.9°F (1954) | 18.0°F (1964) | 0.46 in (2016) |
| May 7 | 84.0°F (1992) | 19.9°F (1922) | 0.55 in (1994) |
| May 8 | 91.9°F (1949) | 5.0°F (1983) | 1.13 in (1955) |
| May 9 | 86.0°F (1925) | 19.9°F (1920) | 0.58 in (2005) |
| May 10 | 84.0°F (1925) | 18.0°F (1920) | 0.96 in (1966) |
| May 11 | 84.9°F (1936) | 18.0°F (2000) | 0.70 in (1915) |
| May 12 | 86.0°F (1924) | 19.0°F (1943) | 0.45 in (1915) |
| May 13 | 87.1°F (1976) | 18.0°F (1943) | 1.05 in (1941) |
| May 14 | 84.9°F (1973) | 18.0°F (1920) | 1.01 in (1925) |
| May 15 | 84.0°F (2006) | 12.9°F (1917) | 0.61 in (1949) |
| May 16 | 89.1°F (1925) | 21.0°F (1924) | 2.40 in (1996) |
| May 17 | 91.0°F (2008) | 18.0°F (1918) | 0.44 in (1991) |
| May 18 | 90.0°F (1954) | 18.0°F (1974) | 1.01 in (1957) |
| May 19 | 89.1°F (1954) | 19.0°F (1936) | 1.11 in (1972) |
| May 20 | 88.0°F (1924) | 21.0°F (1976) | 0.34 in (1948) |
| May 21 | 90.0°F (1929) | 24.1°F (1919) | 0.50 in (1953) |
| May 22 | 90.0°F (1949) | 19.0°F (1960) | 0.61 in (1959) |
| May 23 | 88.0°F (1924) | 21.9°F (1920) | 0.60 in (1959) |
| May 24 | 90.0°F (1924) | 19.9°F (1916) | 0.90 in (1931) |
| May 25 | 89.1°F (1982) | 21.9°F (1920) | 1.00 in (1931) |
| May 26 | 89.1°F (1936) | 23.0°F (1918) | 1.49 in (1942) |
| May 27 | 90.0°F (1983) | 21.0°F (1961) | 0.92 in (1959) |
| May 28 | 91.9°F (1984) | 21.9°F (1920) | 0.24 in (1942) |
| May 29 | 93.9°F (2003) | 21.0°F (1976) | 0.65 in (1935) |
| May 30 | 90.0°F (2020) | 19.9°F (1927) | 0.75 in (1990) |
| May 31 | 89.1°F (1950) | 24.1°F (1927) | 0.68 in (1967) |