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

Current Conditions

(Updated: 12:53 PM PST SAT NOV 21 2009)

Partly Cloudy, 64°F	Humidity: 58%	Dewpoint: 49°F
	Wind Speed: S 9.2 MPH (8 KT)	Heat Index: 64°F
	Barometer: 29.93 in.	Wind Chill: 64°F

Weather Forecast

(Generated: 3:30 AM PST SAT NOV 21 2009)

	Hi: 66°F	Today: Partly cloudy. Patchy dense fog in the morning. Visibility one quarter mile or less at Times in the morning. Highs 63 to 68. Light winds.
	Lo: 50°F
	Hi: 71°F	Sunday: Mostly sunny. Patchy fog in the morning. Highs around 66 near the coast to 68 to 73 inland. Light winds.
	Lo: 51°F
	Hi: 76°F	Monday: Sunny. Highs 66 to 71 near the coast to 73 to 78 inland. Light winds.
	Lo: 52°F
	Hi: 78°F	Tuesday: Sunny. Highs 68 to 73 near the coast to 75 to 80 inland.
	Lo: 52°F
	Hi: 79°F	Wednesday: Sunny. Highs 69 to 74 near the coast to 76 to 81 inland.
	Lo: 53°F
	Hi: 79°F	Thanksgiving day: Sunny. Highs around 72 near the coast to 76 to 81 inland.
	Lo: 53°F

Moon, Sunrise and Sunset

	Moon Phase: Waxing Crescent Moon	Civil Twilight: 6:01 AM PST	Sunrise: 6:28 AM PST
		Sunset: 4:45 PM PST	Civil Twilight: 5:12 PM PST

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