Climateby Month

San Diego, CA climate by month

NOAA 1991-2020 normals · 63 ft elevation · also covers Chula Vista

San Diego is mild year-round, with normal highs between 66°F in December and 77°F in August. The wettest month is February (about 7 wet days) and the driest is August (about 0). The most comfortable time to visit is May and June.

Warmest month
77°F
August normal high
Coldest month
50°F
December normal low
Wet days a year
40
9.8 in of precipitation
Muggy days a year
16
dew point 65°F or higher

How warm is San Diego?

Normal highs range from 66°F in December to 77°F in August.

50°60°70°80° January: normal high 66°F (19°C), low 50°F (10°C) 66° 50° February: normal high 66°F (19°C), low 52°F (11°C) March: normal high 67°F (19°C), low 55°F (13°C) April: normal high 69°F (21°C), low 57°F (14°C) May: normal high 70°F (21°C), low 60°F (16°C) June: normal high 72°F (22°C), low 63°F (17°C) July: normal high 75°F (24°C), low 66°F (19°C) August: normal high 77°F (25°C), low 68°F (20°C) 77° 68° September: normal high 77°F (25°C), low 66°F (19°C) October: normal high 75°F (24°C), low 62°F (17°C) November: normal high 71°F (22°C), low 55°F (13°C) December: normal high 66°F (19°C), low 50°F (10°C) JFMAMJJASOND

Bars run from the normal low to the normal high for each month.

How rainy is San Diego?

February has the most wet days (about 7); the year brings about 9.8 in of precipitation.

January: 7 wet days February: 7 wet days 7 March: 6 wet days April: 4 wet days May: 2 wet days June: 1 wet days July: 1 wet days August: 0 wet days 0 September: 1 wet days October: 2 wet days November: 4 wet days December: 6 wet days JFMAMJJASOND

Wet day: at least 0.01 in of rain or melted snow, counted from daily records 1991-2020.

How humid is San Diego?

Muggy days peak in August, at about 7 days.

January: 0 muggy days 0 February: 0 muggy days March: 0 muggy days April: 0 muggy days May: 0 muggy days June: 0 muggy days July: 3 muggy days August: 7 muggy days 7 September: 5 muggy days October: 0 muggy days November: 0 muggy days December: 0 muggy days JFMAMJJASOND

Muggy day: daily mean dew point of 65°F or higher, from hourly observations 1991-2020 at San Diego International Airport, 2.0 mi NW of the city center.

How much daylight?

Daylight ranges from about 10.0 hours in December to 14.3 hours in June.

January: 10.3 hours of daylight February: 11.0 hours of daylight March: 12.0 hours of daylight April: 13.0 hours of daylight May: 13.8 hours of daylight June: 14.3 hours of daylight 14.3 July: 14.1 hours of daylight August: 13.3 hours of daylight September: 12.4 hours of daylight October: 11.4 hours of daylight November: 10.5 hours of daylight December: 10.0 hours of daylight 10.0 JFMAMJJASOND
See all numbers
Monthly climate normals and day counts for San Diego, 1991-2020
MonthHighLowPrecip.Wet daysMuggy daysDaylight
January 66°F50°F 2.0 in7 0 10.3 h
February 66°F52°F 2.2 in7 0 11.0 h
March 67°F55°F 1.5 in6 0 12.0 h
April 69°F57°F 0.7 in4 0 13.0 h
May 70°F60°F 0.3 in2 0 13.8 h
June 72°F63°F 0.05 in1 0 14.3 h
July 75°F66°F 0.08 in1 3 14.1 h
August 77°F68°F 0.01 in0 7 13.3 h
September 77°F66°F 0.1 in1 5 12.4 h
October 75°F62°F 0.5 in2 0 11.4 h
November 71°F55°F 0.8 in4 0 10.5 h
December 66°F50°F 1.7 in6 0 10.0 h

High and low: NOAA 1991-2020 normal daily high and low. Wet days: at least 0.01 in of rain or melted snow. Muggy days: daily mean dew point 65°F or higher.

Best months to visit San Diego

By our comfort score, the best months are May and June.

Comfort score by month (0-100) and its parts, in days per month
MonthScoreComfortableNotable rainHot or cold
Jan 631440
Feb 641240
Mar 721730
Apr 802020
May 892510
Jun 902400
Jul 721100
Aug 63600
Sep 65901
Oct 752011
Nov 772320
Dec 651630

Score = 40 × share of comfortable days + 25 × share of days without notable rain + 20 × share of days neither hot (90°F+) nor cold (high 40°F or below) + 15 × daylight. How the score works.

Frost dates in San Diego

San Diego is frost-free: NOAA's 1991-2020 normals record no nights at 32°F or below at San Diego Lindbergh Fld.

Station: San Diego Lindbergh Fld (USW00023188), NOAA 1991-2020 freeze probabilities. Frost dates for every city in California.

Hottest and coldest readings, 1991-2020

The highest reading was 101°F (September 26, 2016, and 1 other day); the lowest was 35°F (January 15, 2007).

From the temperature station's daily records with NOAA quality flags removed. Not an all-time record.

Near San Diego

Similar climates elsewhere

Also covers

Chula Vista uses the same temperature and rain stations as San Diego, so its monthly numbers are the ones on this page.

Where the numbers come from

  • Temperature, rain, frost dates and humidity and wind by hour: San Diego Lindbergh Fld (USW00023188), 2.0 mi NW of the city center, 15 ft . NOAA normals and daily records, 1991-2020.
  • Snowfall and snow depth: Chula Vista (USC00041758), 6.7 mi SE of the city center, 56 ft . NOAA normals and daily records, 1991-2020.
  • Daily humidity and wind: San Diego International Airport (722900-23188), 2.0 mi NW of the city center, 15 ft . Hourly observations, 1991-2020.
  • Not available for this location: cloud cover (no station close enough or similar enough in elevation).

Distances from the city center (USGS). Methodology · Report an error