2025 Compare Climate & Weather:
Costa Mesa, CA vs Urban Honolulu, HI

Highlights

On average, there are 271 sunny days per year in Urban Honolulu. Costa Mesa averages 274 sunny days per year. The US average is 205 sunny days.

Urban Honolulu, Hawaii gets 48.8 inches of rain, on average, per year. Costa Mesa, California gets 12 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Urban Honolulu averages 0 inches of snow per year. Costa Mesa averages 0 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

Urban Honolulu, Hawaii
Summer High: the July high is around 84.9 degrees
Winter Low: the January low is 65.3
Rain: averages 48.8 inches of rain a year
Snow: averages 0 inches of snow a year

Costa Mesa, California
Summer High: the July high is around 77.7 degrees
Winter Low: the January low is 47.8
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 Honolulu is 8.3 (10=best), which means it is less comfortable than most places in Hawaii.

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.

Today's Weather - Costa Mesa, CA

66°F

Today's Weather - Urban Honolulu, HI

84°F

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: Costa Mesa / Urban Honolulu

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.

September is the hottest month for Honolulu with an average high temperature of 85.8°, which ranks it as warmer than most places in Hawaii. In Honolulu, there are 10 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Honolulu are January, February and March.

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

January has the coldest nighttime temperatures for Honolulu with an average of 65.3°. This is warmer than most places in Hawaii.

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

In Honolulu, there are 7.8 days annually when the high temperature is over 90°, which is hotter than most places in Hawaii.

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 Honolulu, there are 0.0 days annually when the nighttime low temperature falls below freezing, which is one of the coldest places in Hawaii.

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.

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

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.


December is the wettest month in Honolulu with 6.3 inches of rain, and the driest month is May with 2.7 inches. The wettest season is Spring with 31% of yearly precipitation and 19% occurs in Autumn, which is the driest season. The annual rainfall of 48.8 inches in Honolulu means that it is about average compared to other places in Hawaii.

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.

July is the rainiest month in Honolulu with 18.7 days of rain, and February is the driest month with only 12.6 rainy days. There are 194.9 rainy days annually in Honolulu, which is rainier than most places in Hawaii. The rainiest season is Autumn when it rains 27% of the time and the driest is Spring with only a 23% 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.

There is rarely any recorded snowfall in Honolulu, ranking it as one of the least snowy places in Hawaii.

Any measurable snowfall is a rare occurance in Costa Mesa.

Any measurable snowfall is a rare occurance in Honolulu.