2025 Compare Climate & Weather:
Fountain Hills, AZ vs Costa Mesa, CA

Highlights

On average, there are 274 sunny days per year in Costa Mesa. Fountain Hills averages 300 sunny days per year. The US average is 205 sunny days.

Costa Mesa, California gets 12 inches of rain, on average, per year. Fountain Hills, Arizona gets 13.3 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Costa Mesa averages 0 inches of snow per year. Fountain Hills averages 0 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

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

Fountain Hills, Arizona
Summer High: the July high is around 104.3 degrees
Winter Low: the January low is 42.4
Rain: averages 13.3 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.

The annual BestPlaces Comfort Index for Fountain Hills is 7.4 (10=best), which means it is less comfortable than most places in Arizona.

Today's Weather - Fountain Hills, AZ

59°F

Today's Weather - Costa Mesa, CA

56°F

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: Fountain Hills / Costa Mesa

July is the hottest month for Fountain Hills with an average high temperature of 104.3°, which ranks it as warmer than most places in Arizona. In Fountain Hills, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Fountain Hills are March, November and April.

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.

January has the coldest nighttime temperatures for Fountain Hills with an average of 42.4°. This is one of the warmest places in Arizona.

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 Fountain Hills, there are 157.6 days annually when the high temperature is over 90°, which is hotter than most places in Arizona.

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 Fountain Hills, there are 3.2 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Arizona.

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

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.

March is the wettest month in Fountain Hills with 1.7 inches of rain, and the driest month is June with 0.1 inches. The wettest season is Spring with 37% of yearly precipitation and 18% occurs in Summer, which is the driest season. The annual rainfall of 13.3 inches in Fountain Hills means that it is wetter than most places in Arizona.


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.

August is the rainiest month in Fountain Hills with 5.5 days of rain, and June is the driest month with only 0.5 rainy days. There are 39.8 rainy days annually in Fountain Hills, which is less rainy than most places in Arizona. The rainiest season is Spring when it rains 33% of the time and the driest is Summer with only a 20% chance of a rainy day.

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 Fountain Hills, ranking it as one of the least snowy places in Arizona.

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 Fountain Hills.

Any measurable snowfall is a rare occurance in Costa Mesa.