Average Air Temperatures Across San Diego (2024)

Highlights

Temperatures by Location

Coastal Temperature Chart

Coastal Inland Temperature Chart

Mountain Temperature Chart

Air Temperatures by Region in San Diego

San Diego is known worldwide for having great weather and a big part of that is its temperate climate, complete with comfortable temperatures in all areas year-round.

Unlike other regions of the US, San Diego experiences very little in the way of harsh weather or highly variable air temperatures. Its consistently warm, sunny weather makes it a popular destination spot year-round, as even in the winter months, it’s rarely cold enough for jackets and scarves.

The whole region is blessed with a climate that rarely experiences extremes of temperature, although inland areas can experience hot spells during the summer months.

Temperatures can reach highs of over 100 degrees in the summer months in the desert and just below 40 degrees at night in the winter months. Primarily in the transition, mountain and desert areas, you can expect relatively mild temperatures in the 60s and 70s to be available almost any time of the year for your visit to San Diego.

Coastal Region Air Temperature

Sunny Day at Windansea Beach

Year-round maximum temperatures range from the high 60s to the 70s in August and September. With the ocean nearby, beachgoers will be comfortable even during the warmest months, as the coast almost never gets warmer than 80 degrees.

The ocean breeze tends to keep San Diego’s coast a bit cooler than its inland regions. With fewer buildings to block the breeze and more exposure to winds coming in from the Pacific Ocean, vacationing on the coast is most enjoyable during summertime. Still, temperatures rarely drop below the low 50s in winter.

San Diego Coastal - Temperature Averages Chart (°F)

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

☆

Max

67°

68°

69°

71°

70°

73°

77°

79°

78°

73°

68°

Min

51°

53°

56°

59°

60°

63°

67°

69°

67°

63°

56°

51°

Year-round maximum temperatures range from the high 60s to the 70s in August and September and rarely drop below the low 50s in winter.

San Diego Weather Forecast

July

66°F / 81°F

August

68°F / 83°F

September

66°F / 82°F

Coastal Inland Region Air Temperature

Washington Square in Old Town

The coastal inland area tops out with high temperatures in the summer afternoons of July through October in the low 80s. These regions can get a bit warmer than the coast, but they’re still fairly temperate year-round.

As you get further inland, air temperatures tend to hit higher highs and lower lows. Winter months are still tolerable with just a light jacket though, with low temperatures bottoming just below 50 degrees in the winter months of December, January and February.

San Diego Coastal Inland - Temperature Averages Chart (°F)

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

☆

Max

68°

69°

70°

73°

70°

76°

81°

83°

82°

Upland Central Region Air Temperature

Trailhead at Iron Mountain in Poway

In the areas of Poway and La Mesa, it's a similar picture to Coastal Inland temperatures in the winter months. Temperatures hover between lows in the 50s and highs in the 70s, remaining comfortable without dipping too low to enjoy outdoor activities like hiking and sightseeing.

Temperatures can climb to the mid- to high-80s in the summer months, reaching their peak in August and remaining warm until October.

San Diego Upland Central - Temperature Averages Chart (°F)

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

☆

Max

67°

69°

70°

75°

71°

77°

83°

85°

83°

81°

74°

67°

Min

50°

52°

55°

56°

60°

64°

65°

64°

61°

54°

49°

In the areas of Poway and La Mesa, it's a similar picture in the winter months, though it can climb to the mid-to-high 80s in the summer months.

Transition Region Air Temperature

In the transition zone, the mercury can climb into the 90s with pleasant average high temperatures from November until May. Interestingly, Ramona experiences some of the lowest winter temperatures, dropping down as low as 37 degrees in December.

While it’s a good idea to bundle up if you’re planning on spending the day or evening outdoors on particularly cold days in winter, these low temperatures aren’t very common. You can expect that only on rare occasions will the temperature drop down below 50 degrees in most regions, even at night.

San Diego Transition - Temperature Averages Chart (°F)

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

☆

Max

66°

68°

70°

74°

85°

91°

92°

87°

83°

75°

67°

Min

39°

41°

44°

50°

54°

59°

56°

49°

42°

37°

You can expect that only on rare occasions will the temperature drop down below 50 degrees in most regions, even at night.

Mountain Region Air Temperature

We love the Julian Beer Co for its food and beer!

With the increase in elevation, the mountain area in and around Julian has some of the widest range of temperature variance in all of San Diego. There’s plenty of heat, with highs for the year averaging 86 degrees in the summer months of July and August and average low temperatures dipping just below 40s in the winter months of December, January and February.

San Diego’s mountains are also one of the few places where snowfall occurs during the winter! While it’s very rare for most of Southern California to experience a white Christmas, precipitation isn’t nearly as uncommon at higher elevations.

To have the best chance at experiencing a snowy day in San Diego, visit during January or February, though occasional snow showers have been recorded in March.

San Diego Mountain - Temperature Averages Chart (°F)

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

☆

Max

54°

56°

59°

64°

68°

81°

86°

92°

87°

83°

62°

54°

Min

39°

43°

45°

47°

58°

63°

59°

56°

51°

46°

39°

With the increase in elevation, the mountain area in and around Julian has some of the widest range of temperature variance in all of San Diego with highs for the year averaging 86 degrees in the summer months of July and August and average low temperatures dipping just below 40s in the winter months of December, January and February.

Save BIG with Go City!

The World Famous San Diego Zoo

Explore the top zoo in America! The San Diego Zoo is located in iconic Balboa Park, and features over 3,500 animal in their habitats. Bundle with other attractions in Balboa Park for top savings - like the Air and Space Museum!

Buy Now

What attractions are included with a Go City San Diego pass?

Attractions that you can visit with a Go City San Diego pass include:

The San Diego Zoo, Birch Aquarium, SeaWorld, Safari Park, LEGOLAND, Harbor Cruise, USS Midway Museum, the NAT Museum, Whaley House, PETCO Park Tour, iFLY San Diego and many, many more!

Want to save more? Use our exclusive discount code GVSD5OFF to save an extra 5%!

Desert Region Air Temperature

Teddy Bear Cholla Cactus in Anza Borrego Desert State Park

In the desert around Borrego Springs, an average air temperature of well over 100 degrees is not uncommon in June, July, and August. However, you can still expect comfortable low temperatures in the 70’s overnight even during the warm summer months.

Variations between daytime highs in the bright direct sunshine and overnight lows can range 30 degrees or more. With low humidity and precipitation, the cool dry air in San Diego’s desert region can feel pleasant against the skin in the evenings, especially during the fall and spring seasons.

San Diego Desert - Temperature Averages Chart (°F)

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

☆

Max

70°

74°

80°

87°

92°

104°

108°

107°

99°

90°

79°

69°

Min

47°

49°

53°

58°

61°

72°

78°

79°

72°

63°

53°

46°

In the desert around Borrego Springs, an average temperature of well over 100 degrees is not uncommon in June, July, and August. However, you can still expect comfortable low temperatures in the 70’s overnight even during the warm summer months.

Popular Activities

Birch Aquarium at Scripps

Discounts Available

Learn More