San Diego weather in April
Temperature, sea and sunshine in April: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in April
Fair
Best time to visit: July – September
What is the weather like in San Diego in April?
In April, San Diego is mild: daytime highs average 19 °C, and nights cool down to about 12 °C. The sea averages 16.0 °C – swimming is only for the hardy. With around 10 hours of sunshine a day, there is plenty of sun. Rain is rare: about 4 days bring 24 mm in total. All in all, April is a so-so month for a holiday in San Diego.
April compared
How the weather changes from March to May. Tap a month to open it.
More details for April
- Daylight
- 12 h 57 min06:20 – 19:18
- UV index
- 9 · very highclear sky, noon (estimate)
- Muggy days
- 0 daysdew point 18 °C or more
- Wind
- 18 km/haverage daily peak
- Cloud cover
- 44 %on average
- Hot days
- 0 days30 °C or more
- Time zone
- UTC−7America/Los_Angeles
How the score comes together
- Temperatureweight 35 %0 %
- Seaweight 25 %0 %
- Sunshineweight 20 %100 %
- Few rainy daysweight 20 %100 %
Each factor is rated from 0 to 100 % and weighted for the travel style “Sun, sea & sand”.
What to pack in April
- Wetsuit for longer swims
- Sunscreen
- Sunglasses & sun hat
- A jumper for the evenings
San Diego in April: quick answers
Is San Diego hot in April?
No. In April, San Diego is mild: daytime highs average 19 °C and nights drop to about 12 °C.
Can you swim in San Diego in April?
Only if you don't mind cold water: in April the sea averages just 16.0 °C. Comfortable swimming is possible from July to September.
Does it rain much in San Diego in April?
Rain is rare: about 4 days bring 24 mm in total.
San Diego month by month
The whole year in San DiegoAll destinations: USA
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, GeoNames (CC BY 4.0)