2025 Compare Climate & Weather:
San Marcos, CA vs Irvine, CA

Highlights

On average, there are 281 sunny days per year in Irvine. San Marcos averages 265 sunny days per year. The US average is 205 sunny days.

Irvine, California gets 12.9 inches of rain, on average, per year. San Marcos, California gets 13.7 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Irvine averages 0 inches of snow per year. San Marcos averages 0 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

Irvine, California
Summer High: the July high is around 81.5 degrees
Winter Low: the January low is 46.3
Rain: averages 12.9 inches of rain a year
Snow: averages 0 inches of snow a year

San Marcos, California
Summer High: the July high is around 80.6 degrees
Winter Low: the January low is 45
Rain: averages 13.7 inches of rain a year
Snow: averages 0 inches of snow a year

BestPlaces Comfort Index

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

The annual BestPlaces Comfort Index for San Marcos is 9.1 (10=best), which means it is one of the most pleasant places in California.

Today's Weather - San Marcos, CA

83°F

Today's Weather - Irvine, CA

87°F

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: San Marcos / Irvine

August is the hottest month for San Marcos with an average high temperature of 82.4°, which ranks it as cooler than most places in California. In San Marcos, there are 8 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for San Marcos are October, June and July.

August is the hottest month for Irvine with an average high temperature of 83.2°, which ranks it as cooler than most places in California. In Irvine, there are 8 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Irvine are October, June and July.

December has the coldest nighttime temperatures for San Marcos with an average of 44.3°. This is warmer than most places in California.

December has the coldest nighttime temperatures for Irvine with an average of 45.5°. This is one of the warmest places in California.

In San Marcos, there are 20.4 days annually when the high temperature is over 90°, which is cooler than most places in California.

In Irvine, there are 17.4 days annually when the high temperature is over 90°, which is cooler than most places in California.

In San Marcos, there are 1.1 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in California.

In Irvine, there are 0.6 days annually when the nighttime low temperature falls below freezing, which is one of the warmest places in California.

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

February is the wettest month in San Marcos with 3.1 inches of rain, and the driest month is June with 0.1 inches. The wettest season is Spring with 58% of yearly precipitation and 2% occurs in Autumn, which is the driest season. The annual rainfall of 13.7 inches in San Marcos means that it is drier than most places in California.


February is the wettest month in Irvine with 3.2 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 12.9 inches in Irvine means that it is drier than most places in California.

February is the rainiest month in San Marcos with 7.2 days of rain, and August is the driest month with only 0.5 rainy days. There are 41.3 rainy days annually in San Marcos, which is less rainy than most places in California. The rainiest season is Spring when it rains 47% of the time and the driest is Autumn with only a 5% chance of a rainy day.

February is the rainiest month in Irvine with 6.5 days of rain, and July is the driest month with only 0.4 rainy days. There are 36.3 rainy days annually in Irvine, 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 San Marcos, ranking it as one of the least snowy places in California.

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

Any measurable snowfall is a rare occurance in San Marcos.

Any measurable snowfall is a rare occurance in Irvine.