San Diego County, CA Climate

San Diego County, California has a mild climate year-round. The average high temperature in July is 79°F and the average low temperature in January is 52°F. Winters are generally mild, with temperatures ranging from the low 40s at night to the mid to upper 60s during the day. Summers are warm and sunny, with temperatures ranging between 70 and 85 degrees Fahrenheit. The area receives an average of 10 inches of rain per year and is usually free from major storms and hurricanes that affect other parts of California.

San Diego County, California gets 14 inches of rain, on average, per year. The US average is 38 inches of rain per year.

San Diego County averages 1 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 263 sunny days per year in San Diego County. The US average is 205 sunny days.

San Diego County gets some kind of precipitation, on average, 41 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 81 degrees
Winter Low: the January low is 43
Rain: averages 14 inches of rain a year
Snow: averages 1 inches of snow a year

Bestplaces Comfort Index

The annual BestPlaces Comfort Index for San Diego County is 9.0 (10=best), which means it is more comfortable than most places in California.

9.3 Summer - 8.4 Winter

June, October and May are the most pleasant months in San Diego County, while January and February are the least comfortable months.

Climate	San Diego, California	United States
	13.5 in.	38.1 in.
	1.2 in.	27.8 in.
	40.5 days	106.2 days
	263 days	205 days
	81.3°	85.8°
	43.3°	21.7°
	9	7
	5.9	4.3
	1965 ft.	2443 ft.

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 San Diego County with an average high temperature of 82.8°, which ranks it as cooler than most places in California. In San Diego County, there are 8 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for San Diego County are June, October and July.

In San Diego County, there are 24.3 days annually when the high temperature is over 90°, which is cooler than most places in California.

December has the coldest nighttime temperatures for San Diego County with an average of 42.7°. This is warmer than most places in California.

In San Diego County, there are 12.4 days annually when the nighttime low temperature falls below freezing, which is about average compared to other places in California.

In San Diego County, 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 San Diego County is generally quite low and comfortable. There are few days during the summer when the humidity becomes unpleasant. The most humid months (but still comfortable) are August, July and September.

February is the wettest month in San Diego County with 2.8 inches of rain, and the driest month is June with 0.1 inches. The wettest season is Spring with 54% of yearly precipitation and 2% occurs in Autumn, which is the driest season. The annual rainfall of 13.5 inches in San Diego County means that it is drier than most places in California.

February is the rainiest month in San Diego County with 7.0 days of rain, and June is the driest month with only 0.7 rainy days. There are 40.5 rainy days annually in San Diego County, 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.

An annual snowfall of 1.2 inches in San Diego County means that it is snowier than most places in California. February is the snowiest month in San Diego County with 0.4 inches of snow, and no months of the year have significant snowfall.

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