April weather forecast and climate
San Diego, CA

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 during the month. The sunshine lasts for 265 hours during the month, and spring afternoons often tend to be breezy. The seawater temperature is 62°F (16.7°C), which is a little cold for swimming, but great for surfing, sailing and other water activities.

What is the temperature in April in San Diego?

The average high-temperature, in April, is 67.5°F (19.7°C), while the average low-temperature is 55.9°F (13.3°C).

What is the average humidity in April in San Diego?

The average relative humidity in April in San Diego, California, is 67%.

How many days does it rain in April in San Diego?

In San Diego, in April, it is raining for 4 days, with typically 0.9" (23mm) of accumulated precipitation.

What is the ocean temperature in April in San Diego?

In San Diego, in April, the average water temperature is 60.6°F (15.9°C). For swimming, a surface water temperature of 60.6°F (15.9°C) is not enjoyable for the majority. It is not considered safe, as controlling breathing becomes progressively more difficult as water temperature decreases below 69.8°F (21°C).

What is the average length of the day in April in San Diego?

In San Diego, California, the average length of the day in April is 13h.

How long on average sun shines in April in San Diego?

In April, the average sunshine is 9.2h.

What is the UV index reading in April in San Diego?

In April, the average UV index is 8.
Average temperature in April - San Diego, CA
  • 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).

  • 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).

Average humidity in April - San Diego, CA
  • 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%).

Average rainfall in April - San Diego, CA
  • 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").

Average rainfall days in April - San Diego, CA
  • 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).

Average sea temperature in April - San Diego, CA
  • 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).

Average daylight in April / Average sunshine in April - San Diego, CA
  • Average daylight in April: 13h

The month with the longest days is June (Average daylight: 14.3h).
The month with shortest days is December (Average daylight: 10h).

  • 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).

Average UV index in April - San Diego, CA
  • 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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