San Diego, CA Weather
San Diego hourly forecast: next 24 hours
Today's high of 80°F (26°C) is right in line with the typical August high of 78°F (26°C).
Current conditions in detail
San Diego weather tomorrow (Wednesday, August 19)
Tomorrow in San Diego looks sunny, with a high of 76° and an overnight low of 71°. Rain is unlikely (12% chance). Winds top out near 9 mph, and the UV index reaches 10 (very high).
San Diego 14-day forecast
About the weather in San Diego
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
| Month | High | Low | Rain days | Precipitation | Sunshine | Humidity |
|---|---|---|---|---|---|---|
| January | 64° | 48° | 6 | 2.9 in | 8.6 h/day | 73% |
| February | 65° | 48° | 5 | 2.1 in | 9.3 h/day | 70% |
| March | 65° | 51° | 8 | 2.2 in | 10.2 h/day | 75% |
| April | 68° | 54° | 3 | 0.8 in | 10.9 h/day | 73% |
| May | 68° | 57° | 3 | 0.6 in | 11.0 h/day | 75% |
| June | 72° | 61° | 0 | 0.1 in | 11.9 h/day | 76% |
| July | 76° | 65° | 0 | 0.2 in | 12.4 h/day | 78% |
| August | 78° | 66° | 0 | 0.3 in | 11.7 h/day | 78% |
| September | 78° | 65° | 1 | 0.4 in | 10.7 h/day | 77% |
| October | 76° | 60° | 2 | 0.4 in | 9.9 h/day | 72% |
| November | 70° | 53° | 4 | 1.1 in | 9.4 h/day | 65% |
| December | 64° | 48° | 5 | 2.2 in | 8.3 h/day | 70% |