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

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
  • The average high temperature in May: 20.3°C

The warmest month (with the highest average high temperature) is August (24.7°C).
The month with the lowest average high temperature is December (18.2°C).

  • The average low temperature in May: 15.2°C

The month with the highest average low temperature is August (19.3°C).
The coldest month (with the lowest average low temperature) is December (9.1°C).

  • The 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%).

  • The average rainfall in May: 5mm

The wettest month (with the highest rainfall) is January (53mm).
The driest month (with the lowest rainfall) is July (1mm).

  • The 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).

  • The average sea temperature in May: 16°C

Best months for swimming (with the highest average sea temperature) are August and September (20°C).
Coldest months (with the lowest average sea temperature) are January, February, March and April (15°C).

  • The average daylight in May: 14h

Months with the longest days are May, June and July (Average daylight: 14h).
Months with shortest days are January, November and December (Average daylight: 10h).

  • The 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).

  • The 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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