Heat Advisory
* WHAT...High temperatures during the peak of the heat on Thursday
and Friday in the mid 80s near the beaches to the mid to upper 90s
for the mesas and other higher coastal terrain expected. Low
temperatures will be mostly in the 70s.
* WHERE...San Diego County Coastal Areas.
*…
Extreme Heat Warning
* WHAT...Dangerously hot conditions with high temperatures in the mid
90s to low 100s expected.
* WHERE...San Diego County Mountains.
* WHEN...Until 8 PM PDT Friday.
* IMPACTS...Heat related illnesses increase significantly during
extreme heat events.
* ADDITIONAL DETAILS...L…
Beach Hazards Statement
* WHAT...Elevated surf of 3-6 feet with sets to 7 feet expected
along with dangerous rip currents and minor coastal flooding.
* WHERE...San Diego County coastal areas and Orange County
coastal areas, particularly along south and southwest-facing
beaches.
* WHEN...Now through Th…
Tomorrow in San Diego looks
sunny, with a high of 81°
and an overnight low of 75°.
Rain is unlikely (7% chance).
Winds top out near 10 mph,
and the UV index reaches 7 (high).
San Diego runs on a dry-summer rhythm: the warmest months are also the driest. June averages 2 mm (0.1 in) while the wet season peaks in January at 2.9 inches (73 mm). Highs range from 64°F (18°C) to 78°F (26°C).
San Diego weather: quick facts
Hottest month: August - highs near 78°F (26°C)
Coldest month: January - highs near 64°F (18°C)
Decade extremes (2015-2024): 98°F (37°C) high · 35°F (2°C) low
Wettest month: January (6 rainy days) · Sunniest: July (12.4 h sun/day)
Climate type:semi-arid
Annual swing: 9°C between the average warmest and coolest month · day to night: 8°C
Average humidity: 74%
Temperatures through the year
At its warmest, in August, San Diego runs to 78°F (26°C) in the afternoon and back to 66°F (19°C) by dawn. January bottoms out at 64°F (18°C) in daylight, 48°F (9°C) after dark. January is the wettest month at 2.9 inches (73 mm) over 6 days; June is the driest.
Rain, sun and snow
Sunshine averages 10.4 hours a day over the year - sunnier than roughly 78% of the cities we track, peaking in July at 12.4 hours. Between the average August and the average January lie 9°C, a narrower spread than about 78% of the cities we track. Across the gridded 2015-2024 daily record, the highest daily maximum for this location was 98°F (37°C) and the lowest daily minimum 35°F (2°C).
Season by season
Spring (March through May)
Spring in San Diego stays on the cool side of mild, with daytime highs averaging 67°F (19°C) and nights around 54°F (12°C); rain comes on about 14 days over the three months. Daylight is generous - around 10.7 hours of sun a day.
Summer (June through August)
Summer is mild and warm here - highs near 75°F (24°C), nights near 64°F (18°C), and precipitation is sparse, near 13 mm (0.5 in) for the season. Daylight is generous - around 12.0 hours of sun a day.
Fall (September through November)
Fall in San Diego is mild and warm, with daytime highs averaging 75°F (24°C) and nights around 59°F (15°C); precipitation is sparse, near 1.9 inches (49 mm) for the season. Daylight is generous - around 10.0 hours of sun a day.
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 comes 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.
10.4 hours a day averaged over the year, peaking in July at 12.4 hours.
What is the coldest month in San Diego?
January, with highs of 64°F (18°C) and lows near 48°F (9°C). The coldest day in the 2015-2024 record fell to 35°F (2°C).
When does it rain most in San Diego?
January, at 2.9 inches (73 mm) over about 6 days. June is the driest month, at 2 mm (0.1 in).
Does it snow in San Diego?
Effectively no. The 2015-2024 record for San Diego shows no regular measurable snowfall.
Which month is warmest in San Diego?
August, averaging 78°F (26°C) by day and 66°F (19°C) overnight. The hottest single day in our 2015-2024 record for this location reached 98°F (37°C).
What should I wear in San Diego?
It depends on the month: August runs to 78°F (26°C) while January holds at 64°F (18°C). The full month-by-month breakdown is in the packing notes above.
Is San Diego a wet city?
13.3 inches (337 mm) a year across 39 wet days - less than 91% of the cities we cover.
What is the best month to go to San Diego?
The best time to visit San Diego is generally January to June, when temperatures sit either side of the peak heat rather than in it. Daytime temperatures in that window sit near 67°F (19°C), with rain on about 4 days a month. For the same question asked the other way round, see where else is warm in January.