Costa Mesa, CA Climate


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United States / California / Los Angeles-Long Beach-Anaheim Metro Area / Orange County / Costa Mesa / Zip Codes
Costa Mesa, CA has a typical Mediterranean climate with warm, dry summers and mild, wet winters. The average daily high temperature during the summer months of June, July, and August is around 70-80°F (21-27°C), while the average daily low temperature during the winter months of December, January, and February is around 50-60°F (10-16°C). Rainfall typically occurs during the winter months with an annual total of approximately 15 inches (38 cm).

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.

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

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.

9.7 Summer - 8.7 Winter
June, October and September are the most pleasant months in Costa Mesa, while January and February are the least comfortable months.

  ClimateCosta Mesa, CaliforniaUnited States
    Unlock38.1 in.
  0.0 in.  Unlock
    Unlock106.2 days
  274 days  Unlock
  77.7°85.8°
    Unlock21.7°
  9.3  Unlock
    Unlock4.3
  98 ft.  Unlock
Climate
YOU SHOULD KNOW

Many people confuse weather and climate but they are different. Weather is the conditions of the atmosphere over a short period of time, and climate is how the atmosphere is over long periods of time.

Weather is how the atmosphere is behaving and its effects upon life and human activities. Weather can change from minute-to-minute. Most people think of weather in terms of temperature, humidity, precipitation, cloudiness, brightness, visibility, wind, and atmospheric pressure.

Climate is the description of the long-term pattern of weather in a place. Climate can mean the average weather for a particular region and time period taken over 30 years. Climate is the average of weather over time.

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.
In Costa Mesa, there are 10.4 days annually when the high temperature is over 90°, which is cooler than most places in California.
December has the coldest nighttime temperatures for Costa Mesa with an average of 47.1°. This is one of the warmest places in California.
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.
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.
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.
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.
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.
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.
Reviews for Costa Mesa
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JESSICA · Newport Beach, CA
CROWDED
Over 15 years ago

Costa mesa has awesome shopping but is way too crowded and I have had 3 cars stolen in the past 5 years along with countless break-ins and theft. Expensive. Close to  More

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Fred · Costa Mesa, CA
Perfect Climate
Over 16 years ago

Costa Mesa has a near perfect climate . . . plenty of sun but rarely over 100 degrees (our house doesn't even have AC). Nestled between Newport Beach and Huntington  More

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Jacob  · Costa Mesa, CA
Cost of Living in Costa Mesa
Over 16 years ago

We have a good amount of low-income, medium-income, and relatively high-income  More

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