San Diego (CA) monthly weather averages

What's the weather like in San Diego?

San Diego is a large coastal city located in the southwestern corner of California. The climate in San Diego is classified as an arid Mediterranean climate, with warm, dry summers but also mild, fairly dry winters. The average temperature in San Diego ranges from the mid-60s Farenheit (18 C) in the winter to the mid-70s (24 C) in the summer. The city also experiences low humidity, which helps to make the climate more comfortable.

Rainfall in San Diego is generally light, with most of the precipitation occurring in the winter months. The average annual rainfall is just over 10 inches (250mm), and most of the rain falls between November and March. The city also experiences a rare, occasional light snowfall during the winter months.

San Diego is well known for an abundance of sunshine throughout the year, with an average of about 260 sunny days per year. This makes San Diego an ideal place for outdoor activities, such as surfing and swimming. In addition, the city's mild climate makes it a popular vacation spot for people from around the world.

Average daytime temperature

The bar chart below shows the average monthly peak daytime temperatures at San Diego

San Diego average temperature chart (Celsius) San Diego average temperature chart (Fahrenheit)
Average monthly temperatures in San Diego (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 18.4 18.9 18.9 20.3 21.3 23.2 25.9 26.7 26 24.2 21.2 18.8
°F 65.1 66 66.1 68.6 70.3 73.7 78.7 80.1 78.9 75.5 70.2 65.9

Please note: these are the average peak daytime temperatures (usually around mid-afternoon) so do not show daytime / night highs and lows. To see the daily range of temperatures have a look at the temperature max / min chart below.

Average rainfall & rainy days

The graph below shows the average rainfall and number of rainy days per month.

San Diego monthly rainfall chart (mm) San Diego monthly rainfall chart (inches)
Average monthly rainfall in San Diego (mm and inches)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
mm 53 43 51 23 5 2 1 2 4 8 33 37
inches 2.1 1.7 2 0.9 0.2 0.1 0 0.1 0.2 0.3 1.3 1.5
Rainy days 6 5 6 4 2 1 1 1 1 2 4 5

Average annual rainfall in San Diego: 177.267mm (69.8 inches)

Average daily sunshine

The bar chart below shows the average daily sunshine hours in San Diego

San Diego average daily sunshine chart
Average daily sunshine San Diego
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Hrs sunshine 8.5 8.8 9.1 10 8.9 9 10.7 10.4 9.2 8.6 8.4 8.2

Day / night temperatures

The graph below shows the daily range of temperatures for each month.

San Diego average minimum / maximum temperatures (Celsius) San Diego average minimum / maximum temperatures (Fahrenheit)
Maximum and minimum daily temperatures in San Diego (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Min °C 7.4 8.3 9.5 11.1 13.3 15.1 17.5 18.3 17 14 10.3 7.5
Max °C 18.7 19.2 19.2 20.6 21.5 23.4 26.2 26.9 26.3 24.4 21.5 19.1
Min °F 45.2 46.9 49 51.9 55.9 59.1 63.4 64.9 62.5 57.2 50.5 45.5
Max °F 55.4 56.7 57.7 60.4 63.3 66.6 71.2 72.7 70.9 66.6 60.6 55.9

Sea temperature

The graph below shows the average sea temperature.

San Diego average sea temperature chart (Celsius) San Diego average sea temperature chart (Fahrenheit)
Average sea temperature around San Diego in degrees centigrade and fahrenheit
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 15.2 15.1 15.4 15.8 16.8 18 19.7 20.5 20.5 19.4 17.7 15.9
°F 59.3 59.2 59.6 60.5 62.2 64.4 67.4 68.9 68.9 67 63.9 60.7

Wind speed

The graph below shows the average wind speed.

San Diego average winspeed by month (km/h) San Diego average winspeed by month (mph)
Average wind speed in San Diego (mph and kmh)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
km/h 11 13 14 15 15 14 14 14 13 12 12 11
mph 7 8 9 9 9 9 9 9 8 8 7 7

A monthly average windspeed of over 16km/h or 10mph suggests a location is fairly windy.

Relative humidity

The graph below shows the average relative humidity.

San Diego relative humidity averages
Average relative humidity in San Diego
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
64% 66% 67% 66% 70% 72% 73% 73% 72% 69% 66% 65%