May weather in El Cajon, CA
The average temperature in El Cajon in May is 66.1°F (55.9°F–76.2°F). Average precipitation: 0.30 inches.
May is a spring month in El Cajon, and is warmer than the annual average of 65.1°F. Daily temperatures swing about 20.3°F between overnight low and afternoon high. Expect about 2 days with precipitation. Daylight averages about 13h 41m. For travel, May is one of the best months of the year to visit.
Avg High
76.2°F
Avg Low
55.9°F
Precipitation
0.30 in
Daylight
13h 41m
May records in El Cajon
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| May 1 | 97.0°F (1996) | 43.0°F (1999) | 0.13 in (1983) |
| May 2 | 97.0°F (2014) | 46.9°F (1983) | 0.33 in (1980) |
| May 3 | 104.0°F (2004) | 46.9°F (1983) | 0.04 in (2025) |
| May 4 | 98.1°F (2004) | 46.0°F (1988) | 0.19 in (2023) |
| May 5 | 100.0°F (1990) | 45.0°F (1999) | 0.23 in (1998) |
| May 6 | 100.0°F (1990) | 44.1°F (2024) | 0.45 in (2013) |
| May 7 | 93.9°F (2004) | 45.0°F (1983) | 0.90 in (2017) |
| May 8 | 95.0°F (2001) | 44.1°F (1986) | 0.46 in (2017) |
| May 9 | 95.0°F (1981) | 44.1°F (1986) | 0.08 in (2015) |
| May 10 | 99.0°F (2025) | 43.0°F (2003) | 0.12 in (1980) |
| May 11 | 95.0°F (1996) | 46.0°F (2003) | 0.10 in (1982) |
| May 12 | 99.0°F (2013) | 30.9°F (1999) | 0.03 in (2018) |
| May 13 | 100.9°F (2013) | 46.9°F (1985) | 0.77 in (1998) |
| May 14 | 99.0°F (2014) | 46.9°F (1985) | 0.03 in (1995) |
| May 15 | 104.0°F (2014) | 46.9°F (1998) | 0.51 in (2015) |
| May 16 | 98.1°F (2014) | 48.0°F (1995) | 0.12 in (2019) |
| May 17 | 98.1°F (2008) | 48.0°F (1981) | 0.11 in (2025) |
| May 18 | 95.0°F (2008) | 48.9°F (1983) | 0.20 in (2011) |
| May 19 | 96.1°F (2008) | 48.0°F (2011) | 0.16 in (2019) |
| May 20 | 93.9°F (2017) | 48.0°F (1991) | 0.35 in (2019) |
| May 21 | 93.0°F (2005) | 46.0°F (1981) | 0.03 in (2018) |
| May 22 | 98.1°F (2001) | 46.9°F (2002) | 0.72 in (2006) |
| May 23 | 93.0°F (2001) | 48.0°F (2021) | 0.41 in (2008) |
| May 24 | 89.1°F (2021) | 45.0°F (2010) | 0.06 in (2018) |
| May 25 | 88.0°F (2006) | 46.0°F (1980) | 0.04 in (2012) |
| May 26 | 93.0°F (2000) | 46.0°F (1980) | 0.05 in (1987) |
| May 27 | 93.9°F (1997) | 48.9°F (1980) | 0.17 in (2019) |
| May 28 | 102.9°F (1984) | 48.0°F (2019) | 0.34 in (1990) |
| May 29 | 98.1°F (1984) | 48.9°F (1980) | 0.14 in (2016) |
| May 30 | 89.1°F (2025) | 46.9°F (2011) | 0.03 in (2016) |
| May 31 | 93.0°F (2004) | 46.9°F (1988) | 0.00 in (1980) |