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

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
March, the first month of the spring, in San Diego, is still a comfortable month, with average temperature ranging between max 64.4°F (18°C) and min 52.7°F (11.5°C).

Temperature

In San Diego, California, the average high-temperature in March is essentially the same as in February - a still enjoyable 64.4°F (18°C). In March, the average low-temperature is 52.7°F (11.5°C).

Humidity

In March, the average relative humidity in San Diego is 68%.

Rainfall

In March, the rain falls for 7.6 days. Throughout March, 0.83" (21mm) of precipitation is accumulated. Throughout the year, there are 61.8 rainfall days, and 8.7" (221mm) of precipitation is accumulated.

Ocean temperature

In March, the average ocean temperature is 59.4°F (15.2°C).
Note: 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).

Daylight

The average length of the day in San Diego is 12h.

Sunshine

The average sunshine in March is 8.7h.

UV index

January through March, November and December, with an average maximum UV index of 4, are months with the lowest UV index in San Diego. A UV Index reading of 3 to 5 represents a moderate health risk from unsafe exposure to the UV radiation for ordinary individuals.
Note: In March, the average maximum UV index of 4 translate into the following recommendations:
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.

What is the temperature in March in San Diego?

In March, in San Diego, the average high-temperature is 64.4°F (18°C), and the average low-temperature is 52.7°F (11.5°C).

What is the average humidity in March in San Diego?

In March, the average relative humidity in San Diego is 68%.

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

In San Diego, California, in March, it is raining for 7.6 days, with typically 0.83" (21mm) of accumulated precipitation.

How cold is the water in March in San Diego?

In San Diego, the average seawater temperature in March is 59.4°F (15.2°C). For most, swimming in 59.4°F (15.2°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 March?

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

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

In March, the average sunshine in San Diego is 8.7h.

What is the month with the lowest UV index in San Diego?

Months with the lowest UV index in San Diego, California, are January through March, November and December, with an average maximum UV index of 4.

How high is the UV index in March in San Diego?

In San Diego, the average daily maximum UV index in March is 4. A UV Index value of 3 to 5 symbolizes a moderate health threat from the exposure to the Sun's UV radiation.
Average temperature in March - San Diego, CA
  • Average high temperature in March: 64.4°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 March: 52.7°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 March - San Diego, CA
  • Average humidity in March: 68%

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

Average rainfall in March - San Diego, CA
  • Average rainfall in March: 0.83"

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 March - San Diego, CA
  • Average rainfall days in March: 7.6 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 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: 8.7h

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 March - San Diego, CA
  • Average UV index in March: 4

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).