April weather in San Marcos, CA
The average temperature in San Marcos in April is 63.0°F (51.8°F–74.2°F). Average precipitation: 0.99 inches.
April is a spring month in San Marcos, and is cooler than the annual average of 65.8°F. Daily temperatures swing about 22.4°F between overnight low and afternoon high. Expect about 4 days with precipitation. Daylight averages about 12h 50m. For travel, April is one of the best months of the year to visit.
Avg High
74.2°F
Avg Low
51.8°F
Precipitation
0.99 in
Daylight
12h 50m
April records in San Marcos
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| April 1 | 93.9°F (2021) | 28.9°F (2003) | 0.80 in (1998) |
| April 2 | 91.0°F (1985) | 35.1°F (2003) | 0.20 in (2014) |
| April 3 | 87.1°F (2015) | 39.0°F (1980) | 0.16 in (1981) |
| April 4 | 98.1°F (1989) | 35.1°F (2023) | 0.32 in (1987) |
| April 5 | 99.0°F (1989) | 37.9°F (1999) | 0.15 in (1990) |
| April 6 | 102.0°F (1989) | 39.0°F (1980) | 0.74 in (1986) |
| April 7 | 102.9°F (1989) | 36.0°F (2008) | 1.20 in (2020) |
| April 8 | 102.0°F (2022) | 39.0°F (1983) | 0.38 in (2020) |
| April 9 | 93.9°F (2014) | 36.0°F (2008) | 0.48 in (1994) |
| April 10 | 93.0°F (2018) | 41.0°F (2001) | 3.14 in (2020) |
| April 11 | 91.9°F (2025) | 36.0°F (1999) | 0.36 in (2012) |
| April 12 | 88.0°F (1988) | 39.9°F (1991) | 0.60 in (1998) |
| April 13 | 96.1°F (2008) | 42.1°F (1982) | 0.46 in (2012) |
| April 14 | 89.1°F (1987) | 39.9°F (1983) | 0.71 in (2003) |
| April 15 | 87.1°F (1984) | 42.1°F (1983) | 1.80 in (2003) |
| April 16 | 91.9°F (2011) | 42.1°F (1998) | 0.70 in (1995) |
| April 17 | 91.9°F (1999) | 43.0°F (1998) | 0.66 in (1990) |
| April 18 | 91.0°F (2016) | 44.1°F (2013) | 0.94 in (2000) |
| April 19 | 93.0°F (1999) | 43.0°F (2005) | 0.33 in (1981) |
| April 20 | 91.0°F (1999) | 44.1°F (1995) | 1.25 in (1988) |
| April 21 | 91.9°F (2023) | 43.0°F (1984) | 0.55 in (1988) |
| April 22 | 93.9°F (2017) | 42.1°F (2001) | 0.94 in (1988) |
| April 23 | 93.0°F (2020) | 45.0°F (1980) | 0.28 in (1980) |
| April 24 | 93.9°F (2020) | 43.0°F (1980) | 0.53 in (1994) |
| April 25 | 93.9°F (2020) | 45.0°F (1989) | 0.37 in (1994) |
| April 26 | 100.0°F (2004) | 45.0°F (1989) | 0.67 in (2014) |
| April 27 | 100.0°F (2004) | 43.0°F (2016) | 0.21 in (1994) |
| April 28 | 91.9°F (1992) | 37.0°F (1997) | 0.95 in (2005) |
| April 29 | 93.9°F (2015) | 45.0°F (2016) | 0.55 in (1983) |
| April 30 | 97.0°F (2021) | 48.0°F (1985) | 0.53 in (1983) |