San Diego weather in August
Temperature, sea and sunshine in August: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in August
Excellent
Best time to visit: July – September
What is the weather like in San Diego in August?
In August, San Diego is warm: daytime highs average 26 °C, and nights cool down to about 18 °C. The sea averages 21.0 °C – refreshing for a swim. With around 12 hours of sunshine a day, there is plenty of sun. It hardly ever rains. All in all, August is an excellent month for a holiday in San Diego.
August compared
How the weather changes from July to September. Tap a month to open it.
| JulyJul | AugustAug | SeptemberSep | |
|---|---|---|---|
| Score | 83 | 89 | 88 |
| Day | 24° | 26° | 25° |
| Night | 17° | 18° | 18° |
| Sea | 20° | 21° | 21° |
| Sun | 12 h | 12 h | 10 h |
| Rain days | 1 | 0 | 1 |
More details for August
- Daylight
- 13 h 24 min06:12 – 19:35
- UV index
- 10 · very highclear sky, noon (estimate)
- Muggy days
- 10 daysdew point 18 °C or more
- Wind
- 16 km/haverage daily peak
- Cloud cover
- 25 %on average
- Hot days
- 1 day30 °C or more
- Time zone
- UTC−7America/Los_Angeles
How the score comes together
- Temperatureweight 35 %100 %
- Seaweight 25 %57 %
- Sunshineweight 20 %100 %
- Few rainy daysweight 20 %100 %
Each factor is rated from 0 to 100 % and weighted for the travel style “Sun, sea & sand”.
What to pack in August
- Swimwear
- Sunscreen
- Sunglasses & sun hat
- Light, breathable clothes
San Diego in August: quick answers
Is San Diego hot in August?
Warm rather than hot: in August, daytime highs in San Diego average 26 °C and nights cool to about 18 °C. On about 1 days the thermometer climbs to 30 °C or more.
Can you swim in San Diego in August?
Yes. In August the sea averages 21.0 °C – refreshing for a swim.
Does it rain much in San Diego in August?
It hardly ever rains.
San Diego month by month
The whole year in San DiegoAll destinations: USA
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, GeoNames (CC BY 4.0)