Heat Advisory
* WHAT...High temperatures mostly in the mid 80s to upper 90s
expected.
* WHERE...San Diego County Mountains.
* WHEN...Until 8 PM PDT Sunday.
* IMPACTS...Hot temperatures may cause heat illnesses.
Heat Advisory
* WHAT...High temperatures mostly in the mid 80s to upper 90s
expected.
* WHERE...San Diego County Mountains.
* WHEN...Until 8 PM PDT Saturday.
* IMPACTS...Hot temperatures may cause heat illnesses.
Tomorrow in San Diego looks
sunny, with a high of 80°
and an overnight low of 72°.
Rain is unlikely (4% chance).
Winds top out near 10 mph,
and the UV index reaches 11 (very high).
Located in California, United States, San Diego experiences a semi-arid climate with big day-to-night temperature swings and modest rainfall. Afternoon temperatures peak near 78°F (26°C) in August and dip to about 64°F (18°C) in January, with around 13.3 inches (337 mm) of precipitation falling across the year.
San Diego weather: quick facts
Hottest month: August - highs near 78°F (26°C)
Coldest month: January - highs near 64°F (18°C)
Record high: 98°F (37°C) · Record low: 35°F (2°C) (2015–2024)
Wettest month: January (6 rainy days) · Sunniest: July (12.4 h sun/day)
Climate type:semi-arid - big day-to-night temperature swings and modest rainfall
Temperatures through the year
The warmest stretch of the year centers on August. Highs average 78°F (26°C) and overnight lows stay near 66°F (19°C). The coolest month is January, with typical highs of 64°F (18°C) and lows around 48°F (9°C). Based on 2015–2024 weather data, temperatures have reached as high as 98°F (37°C) and dropped as low as 35°F (2°C).
Rain, sun and snow
January is usually the wettest month. It brings about 2.9 inches (73 mm) of rain over 6 days, while June is the driest. July brings the most sunshine, averaging 12.4 hours of sun a day.
Season by season
Spring (March through May)
Spring in San Diego is mild, with daytime highs averaging 67°F (19°C) and nights around 54°F (12°C); rain falls on about 14 days over the three months.
Summer (June through August)
Summer in San Diego is mild and warm, with daytime highs averaging 75°F (24°C) and nights around 64°F (18°C); precipitation is infrequent.
Fall (September through November)
Fall in San Diego is pleasantly warm, with daytime highs averaging 75°F (24°C) and nights around 59°F (15°C); precipitation is infrequent.
Winter (December through February)
Winter in San Diego is crisp but comfortable, with daytime highs averaging 64°F (18°C) and nights around 48°F (9°C); rain falls on about 16 days over the three months.
Average temperatures in San Diego by month
Monthly averages for San Diego based on 2015–2024 weather data.
August is the hottest month in San Diego, with average highs of 78°F (26°C) and overnight lows near 66°F (19°C). In the past decade the temperature has peaked at 98°F (37°C).
What is the coldest month in San Diego?
January is the coldest month, with highs averaging 64°F (18°C) and lows around 48°F (9°C). The lowest reading in recent years was 35°F (2°C).
What is the rainiest month in San Diego?
January is typically the wettest month, averaging 2.9 inches (73 mm) of precipitation across about 6 days. June is usually the driest.
Does it snow in San Diego?
Snow is essentially absent in San Diego - the 2015–2024 record shows no regular measurable snowfall.
What is the best time to visit San Diego?
The best time to visit San Diego is generally January to June, when temperatures are at their most comfortable before or after the peak heat. Daytime temperatures in that window typically sit near 67°F (19°C).
How sunny is San Diego?
San Diego averages 10.4 hours of sunshine per day across the year. July is the sunniest month at about 12.4 hours of sun a day.
Is San Diego humid?
Relative humidity in San Diego averages about 74% over the year, which feels fairly humid. The most comfortable months tend to fall in the drier part of the year.