May 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
May has dry and cloudy weather in San Diego with the average temperatures in the 59°F (15°C) to 69°F (20.6°C) range.
The daylight touches the highest of 14 hours, but the sun often hides behind the clouds. May occasionally has grey skies due to the foggy conditions, especially in the mornings. The clouds do not bring rain, but the cover increases the average humidity to 71% as the dry season takes hold in San Diego. May is the windiest month of the year, with the average wind speed of 8mph (12.9km/h).

What is the temperature in May in San Diego?

The average high-temperature, in May, is 68.5°F (20.3°C), while the average low-temperature is 59.4°F (15.2°C).

What is the average humidity in May in San Diego?

In May, the average relative humidity in San Diego is 70.6%.

How much does it rain in San Diego in May?

In San Diego, in May, it is raining for 1.4 days, with typically 0.2" (5mm) of accumulated precipitation.

How cold is the water in May in San Diego?

In San Diego, California, in May, the average water temperature is 62.6°F (17°C). For most, swimming in 62.6°F (17°C) is not an enjoyable activity. Furthermore, controlling your breathing becomes progressively more difficult as the water temperature decreases from 69.8°F (21°C) to 59°F (15°C).

How many hours of daylight does San Diego have in May?

In San Diego, California, the average length of the day in May is 13.9h.

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

The average sunshine in May in San Diego is 8.1h.

What is the UV index intensity in May in San Diego?

The average UV index in May is 9.
Average temperature in May - San Diego, CA
  • Average high temperature in May: 68.5°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 May: 59.4°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 May - San Diego, CA
  • Average humidity in May: 70.6%

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 May - San Diego, CA
  • Average rainfall in May: 0.2"

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 May - San Diego, CA
  • Average rainfall days in May: 1.4 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 May - San Diego, CA
  • Average sea temperature in May: 62.7°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 May / Average sunshine in May - San Diego, CA
  • Average daylight in May: 13.9h

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 May: 8.1h

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 May - San Diego, CA
  • Average UV index in May: 9

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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