San Diego, California, United States climate

Average temperatures, precipitation and all-time records for San Diego, California, United States, with every day graded against ~45 years of local climate history (1981–2026). Its warmest month is August, averaging a high of 86°F, and its coldest is January, with an average low of 47°F.

San Diego is a city on the Pacific coast of Southern California, adjacent to the Mexico–United States border. It is the eighth-most populous city in the U.S. via Wikipedia

How today compares

Latest recorded day: 2026-07-21. Each reading placed on San Diego, California, United States's own ±7-day seasonal distribution.

High 85°F Below Normal · 39th pct

Low 69°F Very High · 91st pct

Feels-like 89°F Normal · 44th pct

Humidity 15.6 g/m³ Very High · 97th pct

Wind 12 mph Normal · 52nd pct

Precip 0.00 in Dry

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San Diego average temperatures by month

Typical daily high and low, and average precipitation, for each month in San Diego, California, United States, based on 1981–2026 records. The wettest month is January (0.10 in on an average day).

Month	Avg high	Avg low	Avg precip
January	64°F	47°F	0.10 in
February	64°F	48°F	0.10 in
March	68°F	49°F	0.10 in
April	70°F	51°F	0.00 in
May	73°F	54°F	0.00 in
June	79°F	56°F	0.00 in
July	85°F	62°F	0.00 in
August	86°F	64°F	0.00 in
September	83°F	63°F	0.00 in
October	78°F	59°F	0.00 in
November	71°F	53°F	0.00 in
December	64°F	48°F	0.10 in

Jan 41°–73°

Feb 42°–75°

Mar 44°–78°

Apr 46°–81°

May 49°–84°

Jun 52°–88°

Jul 57°–91°

Aug 58°–93°

Sep 56°–92°

Oct 54°–88°

Nov 47°–80°

Dec 42°–73°

Each bar spans the 10th-percentile daily low to the 90th-percentile daily high (the range most days fall within), coloured cold → hot on a shared -10°F to 115°F scale, so the whole year's rhythm reads at a glance.

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Record extremes

Hottest day on record: 106°F on 2018-07-06
Coldest day on record: 30°F on 1990-12-23

All San Diego weather records →

Percentiles compare each day to San Diego, California, United States's own history, so grades are relative to this location: a “Near Record” day here isn't the same temperature as elsewhere. How the grades work →