March 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
Spring starts in March with pleasant weather and warm temperatures in San Diego. The average temperatures are in the agreeable 43°F (6.1°C) to 66°F (18.9°C) range as the skies host the sun for a daily 8.4 hours.
March sees the back of the Santa Ana winds that drive hot air from the desert to the inland areas. The beginning of spring experiences wet patches of weather, but the rain does not register above 1.8" (45.7mm). The 12-hour long days are sunny and bright, and the atmosphere is lively in San Diego during March. Expect early spring to be a little wet, warm, and breezy with a fresh aroma in the air.

What is the temperature in March in San Diego?

In San Diego, California, in March, the average high-temperature is 65.7°F (18.7°C), and the average low-temperature is 53.2°F (11.8°C).

What is the average humidity in March in San Diego?

In March, the average relative humidity in San Diego is 67.3%.

How much does it rain in San Diego in March?

In San Diego, California, during March, the rain falls for 6.5 days and regularly aggregates up to 2" (51mm) of precipitation.

What is the ocean temperature in March in San Diego?

In San Diego, in March, the average water temperature is 59.4°F (15.2°C). For swimming, a surface water temperature of 59.4°F (15.2°C) is not enjoyable for the majority. It is not considered safe, as controlling breathing becomes progressively more difficult as water temperature decreases below 69.8°F (21°C).

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

In San Diego, the average length of the day in March is 12h.

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

In San Diego, the average sunshine in March is 8.4h.

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

The average UV index in March in San Diego, California, is 6.
Average temperature in March - San Diego, CA
  • Average high temperature in March: 65.6°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 March: 53.2°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 March - San Diego, CA
  • Average humidity in March: 67.3%

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 March - San Diego, CA
  • Average rainfall in March: 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 March - San Diego, CA
  • Average rainfall days in March: 6.5 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 March - San Diego, CA
  • Average sea temperature in March: 59.4°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 March / Average sunshine in March - San Diego, CA
  • Average daylight in March: 12h

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 March: 8.4h

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

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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