July 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
July is the sunniest as well as the most humid month in San Diego, with 305 hours of monthly sunshine amid average humidity at 75%. The daylight lasts for 14 hours, and the weather tends to be warm and dry with hardly any rain.
The days heat up to 80°F (26.7°C) as the average temperatures rise to register between 65°F (18.3°C) and 75°F (23.9°C).
July sees much excitement during various activities such as swimming, fishing, and exploring the canyons and mountains neighboring San Diego. Carry plenty of water, while on excursions in the desert lands.

What is the temperature in July in San Diego?

In July, the average high-temperature is 74.7°F (23.7°C), and the average low-temperature is 65.5°F (18.6°C).

What is the most humid month in San Diego?

July is the most humid month in San Diego, with an average relative humidity of 74.6%.

What is the average humidity in July in San Diego?

In San Diego, the average relative humidity in July is 74.6%.

How much does it rain in San Diego in July?

In San Diego, during July, the rain falls for 0.7 days and regularly aggregates up to 0" (1mm) of precipitation.

What is the driest month in San Diego?

The month with the least rainfall in San Diego is July when the rain falls for 0.7 days and typically collects 0" (1mm) of precipitation.

How cold is the water in July in San Diego?

In July, the average ocean temperature in San Diego is 67.1°F (19.5°C). Swimming in 67.1°F (19.5°C) is not enjoyable for the majority. Controlling breathing becomes progressively more difficult as surface water temperature decreases below 69.8°F (21°C).

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

In San Diego, California, the average length of the day in July is 14.1h.

What month has the most sunshine in San Diego?

The month with the most sunshine in San Diego, California, is July, with an average of 9.8h of sunshine.

How many hours of sunshine does San Diego have in July?

In San Diego, the average sunshine in July is 9.8h.

What are the months with the highest UV index in San Diego?

June through August, with an average UV index of 10, are months with the highest UV index in San Diego.

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

In July, the average UV index is 10.
Average temperature in July - San Diego, CA
  • Average high temperature in July: 74.6°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 July: 65.4°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 July - San Diego, CA
  • Average humidity in July: 74.6%

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 July - San Diego, CA
  • Average rainfall in July: 0"

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 July - San Diego, CA
  • Average rainfall days in July: 0.7 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 July - San Diego, CA
  • Average sea temperature in July: 67°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 July / Average sunshine in July - San Diego, CA
  • Average daylight in July: 14.1h

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 July: 9.8h

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 July - San Diego, CA
  • Average UV index in July: 10

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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