San Diego
California, USA
Long-term weather forecast
Long-term weather forecast

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 in San Diego, California, is a warm summer month, with average temperature varying between 75.4°F (24.1°C) and 64.2°F (17.9°C).

Temperature

In San Diego, the average high-temperature is essentially the same as in June - a moderately hot 75.4°F (24.1°C). The average low-temperature, in San Diego, is 64.2°F (17.9°C).

Humidity

In July, the average relative humidity in San Diego is 72%.

Rainfall

In July, in San Diego, the rain falls for 5.4 days. Throughout July, 0.51" (13mm) of precipitation is accumulated. In San Diego, during the entire year, the rain falls for 61.8 days and collects up to 8.7" (221mm) of precipitation.

Ocean temperature

In San Diego, the average seawater temperature in July is 67.1°F (19.5°C).
Note: 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).

Daylight

The average length of the day in San Diego is 14.1h.

Sunshine

Months with the most sunshine are July and August, with an average of 11.9h of sunshine.

UV index

July through September, with an average maximum UV index of 6, are months with the highest UV index. A UV Index reading of 6 to 7 represents a high health risk from unprotected exposure to the Sun's UV rays for average individuals.
Note: In July, the average maximum UV index of 6 translate into the following recommendations:
Take precautions against overexposure. Protection against sun damage is needed. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.

What is the temperature in July in San Diego?

In July, in San Diego, California, the average high-temperature is 75.4°F (24.1°C), and the average low-temperature is 64.2°F (17.9°C).

What is the average humidity in July in San Diego?

The average relative humidity in July in San Diego is 72%.

How much does it rain in San Diego in July?

In July, the rain falls for 5.4 days. Throughout July, 0.51" (13mm) of precipitation is accumulated.

What is the ocean temperature 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 July, the average length of the day in San Diego is 14.1h.

What are the months with the most sunshine in San Diego?

Months with the most sunshine are July and August, with an average of 11.9h of sunshine.

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

The average sunshine in July in San Diego is 11.9h.

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

July through September, with an average maximum UV index of 6, are months with the highest UV index.

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

In San Diego, California, the average daily maximum UV index in July is 6. A UV Index of 6 to 7 symbolizes a high hazard to health from the exposure to the Sun's UV radiation.
Average temperature in July - San Diego, CA
  • Average high temperature in July: 75.4°F

The warmest month (with the highest average high temperature) is August (77.4°F).
The month with the lowest average high temperature is February (63.1°F).

  • Average low temperature in July: 64.2°F

The month with the highest average low temperature is August (65.7°F).
The coldest month (with the lowest average low temperature) is February (51.8°F).

Average humidity in July - San Diego, CA
  • Average humidity in July: 72%

The month with the highest relative humidity is June (73%).
The month with the lowest relative humidity is November (59%).

Average rainfall in July - San Diego, CA
  • Average rainfall in July: 0.51"

The wettest month (with the highest rainfall) is December (1.65").
The driest month (with the lowest rainfall) is June (0.12").

Average rainfall days in July - San Diego, CA
  • Average rainfall days in July: 5.4 days

The month with the highest number of rainy days is March (7.6 days).
The month with the lowest number of rainy days is June (2.7 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: 11.9h

Months with most sunshine are July and August (Average sunshine: 11.9h).
The month with least sunshine is December (Average sunshine: 6.7h).

Average UV index in July - San Diego, CA
  • Average UV index in July: 6

Months with the highest UV index are July, August and September (UV index 6).
Months with the lowest UV index are January, February, March, November and December (UV index 4).