Costa Mesa (CA) monthly weather averages

Contents

Average daytime temperature

The bar chart below shows the average monthly peak daytime temperatures at Costa Mesa

Costa Mesa average temperature chart (Celsius) Costa Mesa average temperature chart (Fahrenheit)
Average monthly temperatures in Costa Mesa (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 18 18.2 18.2 19.6 20.3 21 23 24 24.4 23 20.3 17.9
°F 64.3 64.8 64.8 67.3 68.5 69.8 73.4 75.3 75.8 73.4 68.5 64.1

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.

Costa Mesa monthly rainfall chart (mm) Costa Mesa monthly rainfall chart (inches)
Average monthly rainfall in Costa Mesa (mm and inches)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
mm 64 57 49 23 4 1 1 2 6 5 37 43
inches 2.5 2.2 1.9 0.9 0.2 0 0 0.1 0.3 0.2 1.5 1.7
Rainy days 5 5 6 3 1 1 0 0 1 2 4 5

Average annual rainfall in Costa Mesa: 206.766mm (81.4 inches)

Average daily sunshine

The bar chart below shows the average daily sunshine hours in Costa Mesa

Costa Mesa average daily sunshine chart
Average daily sunshine Costa Mesa
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Hrs sunshine 7.9 8.5 9.1 10.5 9.5 9.9 11.9 11.5 9.8 8.8 8 7.8

Day / night temperatures

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

Costa Mesa average minimum / maximum temperatures (Celsius) Costa Mesa average minimum / maximum temperatures (Fahrenheit)
Maximum and minimum daily temperatures in Costa Mesa (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Min °C 7.8 8.6 9.4 10.8 12.6 14.7 16.3 17.2 16.5 14.2 10.9 7.9
Max °C 18.2 18.5 18.5 19.9 20.5 21.2 23.2 24.2 24.6 23.2 20.5 18.1
Min °F 46 47.4 48.8 51.4 54.6 58.4 61.3 63 61.6 57.6 51.6 46.2
Max °F 55.4 56.3 57 59.5 61.7 64.2 67.5 69.3 68.9 65.7 60.3 55.4

Sea temperature

The graph below shows the average sea temperature.

Costa Mesa average sea temperature chart (Celsius) Costa Mesa average sea temperature chart (Fahrenheit)
Average sea temperature around Costa Mesa in degrees centigrade and fahrenheit
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 14.9 14.9 15.1 15.6 16.6 18 19.8 20.5 20.4 19.3 17.5 15.7
°F 58.8 58.8 59.3 60 61.8 64.4 67.6 69 68.8 66.7 63.5 60.2

Wind speed

The graph below shows the average wind speed.

Costa Mesa average winspeed by month (km/h) Costa Mesa average winspeed by month (mph)
Average wind speed in Costa Mesa (mph and kmh)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
km/h 10 12 13 14 14 13 13 13 12 11 10 10
mph 7 7 8 9 9 8 8 8 8 7 7 6

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.

Costa Mesa relative humidity averages
Average relative humidity in Costa Mesa
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
65% 68% 68% 66% 69% 71% 70% 71% 70% 69% 67% 66%

Other monthly averages

UV index Best time to go?

Beta

Current (hourly) weather 15 day forecast

Costa Mesa weather stats

Costa Mesa weather statistics
Hottest month: August 24°C 75.2°F
Driest month: July 1mm 0ins
Sunniest month: August 11.5hrs
Coldest month: January 18°C 64.4°F
Wettest month: January 64mm 2.5ins
Warmest sea: August 20.5°C 68.9°F
Map showing location of Costa Mesa (33.64113, -117.91867) Costa Mesa map pin © Google

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