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Costa Mesa, CA Weather


Costa Mesa, CA climate is mild during summer when temperatures tend to be in the 60's and cool during winter when temperatures tend to be in the 50's.

The warmest month of the year is August with an average maximum temperature of 73.00 degrees Fahrenheit, while the coldest month of the year is December with an average minimum temperature of 48.00 degrees Fahrenheit.

Temperature variations between night and day tend to be small during summer with a difference that can reach 8 degrees Fahrenheit, and fairly limited during winter with an average difference of 15 degrees Fahrenheit.

The annual average precipitation at Costa Mesa is 11.65 Inches. Rainfall in is fairly evenly distributed throughout the year. The wettest month of the year is January with an average rainfall of 2.60 Inches.

Weather Data

Normal Climate

Normal Temperatures

(NEWPORT BEACH HARBOR Weather station, 3.58 miles from Costa Mesa)
Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
Max °F 63.6 63.8 63.6 65.5 66.1 68.4 71.4 73.0 72.9 71.2 67.7 64.2 67.6
Mean °F 55.9 56.7 57.4 59.5 61.7 64.3 67.3 68.7 68.1 65.1 60.0 56.1 61.7
Min °F 48.2 49.6 51.2 53.5 57.3 60.2 63.1 64.4 63.2 59.0 52.2 48.0 55.8

Normal Precipitation

(NEWPORT BEACH HARBOR Weather station, 3.58 miles from Costa Mesa)
Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
Inch 2.60 2.54 2.25 0.70 0.18 0.08 0.02 0.09 0.30 0.28 1.02 1.59 11.65