San Diego
California, USA
Long-term weather forecast
Long-term weather forecast
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April weather forecast and Climate
San Diego, CA

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The view of Coronado Island in San Diego, California, from across a water body on a sidewalk, with a row of palm trees
The view of Coronado Island in San Diego, California, from across a water body on a sidewalk, with a row of palm trees
April has beautiful spring weather in San Diego with many sunny days. Temperatures rarely drop below 50°F (10°C), and a few days go past 70°F (21.1°C) as the average temperatures remain in the 56°F (13.3°C) to 68°F (20°C) range.
April sees a decline in the wet conditions as the rainfall limits to 4 days in the month. The sunshine lasts for 265 hours in the month, and spring afternoons often tend to be breezy. The seawater temperature is around 62°F (16.7°C), which is a little cold for swimming, but great for surfing, sailing and other water activities.
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  • The average high temperature in April: 67.5°F

The warmest month (with the highest average high temperature) is August (76.4°F).
The month with the lowest average high temperature is December (64.7°F).

  • The average low temperature in April: 55.9°F

The month with the highest average low temperature is August (66.7°F).
The coldest month (with the lowest average low temperature) is December (48.4°F).

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  • The average humidity in April: 67%

The month with the highest relative humidity is July (74.6%).
The month with the lowest relative humidity is January (63.1%).

  • The average rainfall in April: 0.9"

The wettest month (with the highest rainfall) is January (2.1").
The driest month (with the lowest rainfall) is July (0").

  • The average rainfall days in April: 4 days

The month with the highest number of rainy days is February (7.1 days).
The month with the lowest number of rainy days is August (0.4 days).

  • The average sea temperature in April: 60.6°F

The best month for swimming (with the highest average sea temperature) is August (67.9°F).
The coldest month (with the lowest average sea temperature) is February (58.7°F).

  • The average daylight in April: 13h

Months with the longest days are May, June and July (Average daylight: 14h).
Months with shortest days are January, November and December (Average daylight: 10h).

  • The average sunshine in April: 9.2h

The month with most sunshine is July (Average sunshine: 9.8h).
The month with least sunshine is December (Average sunshine: 7.5h).

  • The average UV index in April: 8

Months with the highest UV index are June, July and August (UV index 10).
Months with the lowest UV index are January and December (UV index 3).

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