Costa Mesa (CA) Climate by Month
The weather in Costa Mesa sees moderate temperature fluctuations over the course of a year.
Temperatures can be warm at the high end
to roughly pleasant at the low end.
The city has a dry climate with very low precipitation levels.
Let’s explore the climate details in depth to provide you with a complete overview.
Average day and night temperature
The weather in Costa Mesa changes moderately throughout the year, offering enough variation to appreciate each season. On average, daytime temperatures range from a comfortable 27°C in September to a pleasant 19°C in January. Nighttime temperatures can drop, with averages reaching 9°C in January.
The mean minimum and maximum temperatures throughout the year
Precipitation and rainy days
Costa Mesa sits in an arid zone with minimal moisture, averaging 202 mm of rainfall per year. The seasons in Costa Mesa, bring significant changes in precipitation. The wettest month, December, receives moderate rainfall, with an average of 55 mm of precipitation. This rainfall is distributed across 7 rainy days. In contrast, the driest month, August, experiences much less rainfall, totaling 0.1 mm over 0 rainy days. These distinct seasonal differences provide diverse experiences throughout the year.The mean monthly precipitation over the year, including rain, hail and snow
The average number of days each month with precipitation
Sunshine over the year
In Costa Mesa, summer days are longer and more sunny, with daily sunshine hours peaking at 12.3 hours in July. As the darker season arrives, the brightness of the sun becomes less. January sees a soft sun for only 6.6 hours.Monthly hours of sunshine
Daily hours of sunshine
The best time of year to visit Costa Mesa in the United States of America
During the months of January, February, March, April, May, June, July, October and November you are most likely to experience good weather with pleasant average temperatures that fall between 20°C and 26°C.Other facts from our historical weather data:
The hottest season / summer takes place in July, August, September and October.
September has an average maximum temperature of 27°C and is the warmest month of the year.
The coldest month is December with an average maximum temperature of 19°C.
December tops the wettest month list with 55 mm of rainfall.
August is the driest month with 0 mm of precipitation.
July is the sunniest month with an average of 369 hours of sunshine.
No idea where to travel to this year? We have a tool that recommends destinations based on your ideal conditions. Find out where to go with our weather planner.
