Climate in Costa Mesa, California

Costa Mesa, CA also has a Mediterranean climate with mild temperatures year-round. Summers are warm and dry while winters are cool but not freezing. The area is known for its coastal breezes.

Costa Mesa, California gets 12 inches of rain, on average, per year. The US average is 38 inches of rain per year.

Costa Mesa averages 0 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 274 sunny days per year in Costa Mesa. The US average is 205 sunny days.

Costa Mesa gets some kind of precipitation, on average, 36 days per year. Precipitation is rain, snow, sleet, or hail that falls to the ground. In order for precipitation to be counted you have to get at least .01 inches on the ground to measure.

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Weather Highlights

Summer High: the July high is around 78 degrees
Winter Low: the January low is 48
Rain: averages 12 inches of rain a year
Snow: averages 0 inches of snow a year

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BESTPLACES COMFORT INDEX

The annual BestPlaces Comfort Index for Costa Mesa is 9.3 (10=best), which means it is one of the most pleasant places in California.

June, October and September are the most pleasant months in Costa Mesa, while January and February are the least comfortable months.

August is the hottest month for Costa Mesa with an average high temperature of 79.4°, which ranks it as cooler than most places in California. In Costa Mesa, there are 7 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Costa Mesa are July, September and August.

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In Costa Mesa, there are 10.4 days annually when the high temperature is over 90°, which is cooler than most places in California.

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December has the coldest nighttime temperatures for Costa Mesa with an average of 47.1°. This is one of the warmest places in California.

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In Costa Mesa, there are 0.1 days annually when the nighttime low temperature falls below freezing, which is one of the warmest places in California.

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In Costa Mesa, there are 0.0 days annually when the nighttime low temperature falls below zero°, which is about average compared to other places in California.

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Humidity in Costa Mesa is generally low and comfortable. But there some days when the humidity becomes unpleasant, especially in August and July. The most humid months (but still comfortable) are August, July and September.

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February is the wettest month in Costa Mesa with 2.8 inches of rain, and the driest month is July with 0.0 inches. The wettest season is Spring with 60% of yearly precipitation and 1% occurs in Autumn, which is the driest season. The annual rainfall of 12.0 inches in Costa Mesa means that it is drier than most places in California.

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February is the rainiest month in Costa Mesa with 6.6 days of rain, and July is the driest month with only 0.4 rainy days. There are 36.4 rainy days annually in Costa Mesa, which is less rainy than most places in California. The rainiest season is Spring when it rains 50% of the time and the driest is Autumn with only a 4% chance of a rainy day.

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There is rarely any recorded snowfall in Costa Mesa, ranking it as one of the least snowy places in California. Any measurable snowfall is a rare occurance in Costa Mesa.

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