May weather forecast
San Diego, CA

Coronado Island in San Diego, California, USA,
Coronado Island in San Diego, California, USA,

Weather in May

May, the last month of the spring in San Diego, is also an enjoyable month, with an average temperature ranging between max 67.6°F (19.8°C) and min 56.3°F (13.5°C).

Temperature

In May, the average high-temperature is essentially the same as in April - a still enjoyable 67.6°F (19.8°C). In San Diego, in May, the average low-temperature is 56.3°F (13.5°C).

Humidity

The average relative humidity in May is 72%.

Rainfall

In San Diego, in May, during 5.7 rainfall days, 0.39" (10mm) of precipitation is typically 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 May, the average ocean temperature is 62.6°F (17°C).
Note: Swimming in 62.6°F (17°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 May is 13h and 52min.
On the first day of May, sunrise is at 6:01 am and sunset at 7:30 pm. On the last day of the month, sunrise is at 5:41 am and sunset at 7:51 pm PDT.

Sunshine

In May, the average sunshine is 10.9h.

UV index

The average daily maximum UV index in May in San Diego is 5. A UV Index estimate of 3 to 5 represents a medium vulnerability from unsafe exposure to UV radiation for the ordinary person.
Note: The daily maximum UV index of 5 in May interpret into the following advice:
Take precautions - Protection against sunburn is recommended. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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FAQ

What is the average humidity in May in San Diego?

The average relative humidity in May is 72%.

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

In San Diego, in May, during 5.7 rainfall days, 0.39" (10mm) of precipitation is typically accumulated.

What is the ocean temperature in May in San Diego?

In San Diego, the average seawater temperature in May is 62.6°F (17°C). Swimming in 62.6°F (17°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 May in San Diego?

In San Diego, California, the average day length in May is 13h and 52min.

What time are sunrise and sunset in May in San Diego?

In May, on the first day of the month, sunrise is at 6:01 am and sunset at 7:30 pm. On the last day of the month, sunrise is at 5:41 am and sunset at 7:51 pm PDT.

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

In May, the average sunshine duration is 10.9h.

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

In May, the average daily maximum UV index in San Diego is 5. A UV Index reading of 3 to 5 represents a moderate vulnerability from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in May
San Diego, CA

Average temperature in May - San Diego, CA
  • Average high temperature in May: 67.6°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 May: 56.3°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).

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Average pressure in May
San Diego, CA

Average pressure in May - San Diego, CA
  • Average pressure in May: 29.92"Hg

The month with the highest atmospheric pressure is January (30.09"Hg).
The months with the lowest atmospheric pressure are June and September (29.88"Hg).

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Average wind speed in May
San Diego, CA

Average wind speed in May - San Diego, CA
  • Average wind speed in May: 6.3mph

The windiest months (with the highest average wind speed) are April and May (6.3mph).
The calmest month (with the lowest average wind speed) is October (5.2mph).

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Average humidity in May
San Diego, CA

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

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

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Average rainfall in May
San Diego, CA

Average rainfall in May - San Diego, CA
  • Average rainfall in May: 0.39"

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

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Average rainfall days in May
San Diego, CA

Average rainfall days in May - San Diego, CA
  • Average rainfall days in May: 5.7 days

The month with the highest number of rainy days is March (7.6 days).
The month with the least rainy days is June (2.7 days).

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Average sea temperature in May
San Diego, CA

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).

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Average daylight in May /
Average sunshine in May
San Diego, CA

Average daylight in May / Average sunshine in May - San Diego, CA
  • Average daylight in May: 13h and 52min

The month with the longest days is June (Average daylight: 14h and 16min).
The month with the shortest days is December (Average daylight: 10h and 2min).

  • Average sunshine in May: 10h and 54min

The months with the most sunshine are July and August (Average sunshine: 11h and 54min).
The month with the least sunshine is December (Average sunshine: 6h and 42min).

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Average sunshine days in May
San Diego, CA

Average sunshine days in May - San Diego, CA
  • Average sunshine days in May: 21.1 days

The month with the most sunshine days is January (24.3 days).
The month with the least sunshine days is July (20.3 days).

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Average UV index in May
San Diego, CA

Average UV index in May - San Diego, CA
  • Average UV index in May: 5

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

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Average cloud cover in May
San Diego, CA

Average cloud cover in May - San Diego, CA
  • Average cloud cover in May: 22

The month with the most cloud cover is December (Cloud cover 24).
The month with the least cloud cover is August (Cloud cover 9).

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Average visibility in May
San Diego, CA

Average visibility in May - San Diego, CA
  • Average visibility in May: 6mi

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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