Weather in San Diego in August 2025
- August is usually the wettest month of the year in San Diego;
Average weather
Average temperature in San Diego in August
Going from a maximum of +82°F during the day to a minimum of +64°F during the night, the temperature in August averages around +77°F.
The average maximum temperature goes down 10% by the end of the month, compared with the beginning of the month, from +79°F to +77°F.
Is San Diego warm or cold in August?
San Diego is typically warm in August.
Maximum temperatures go up compared to the previous month from +73°F to +75°F. The minimum temperature also goes up from +66°F to +66°F.
It’s generally warm, but pack a long-sleeve shirt for evenings.
August is one of the warmest months in San Diego, here is the comparison with other months:
Water temperature in San Diego in August
Water in San Diego in August is Fresh. It varies from +65°F to +70°F, with an average of +68°F. This is almost similar to the air temperature, which averages +75°F.
The water temperature in August is one of the warmest of the entire year:
Can you swim in San Diego in August?
Climate in San Diego in August
| July | August | September | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +73°F | +75°F | +75°F | ||||
| Min. temperature | ||||||
| +59°F | +61°F | +55°F | ||||
| Max. temperature | ||||||
| +95°F | +88°F | +100°F | ||||
| Rainfall | ||||||
| 2 mm | 4 mm | 10 mm | ||||
| Wind | ||||||
| 3 m/s | 3 m/s | 2 m/s | ||||
| Avg. water temperature | ||||||
| +67°F | +68°F | +67°F | ||||
| Humidity | ||||||
| 76% | 76% | 75% | ||||
| Air pressure | ||||||
| 1013 HPa | 1012 HPa | 1011 HPa | ||||
| Sunny days | ||||||
| 3 | 5 | 6 | ||||
| Cloudy days | ||||||
| 26 | 24 | 20 | ||||
| Rainy days | ||||||
| 2 | 2 | 4 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
August weather is still as good as in July. It’s getting warmer as August arrives. The average maximum temperature goes up from +73°F to +75°F during the day. Prepare for more rain. Average rainfall goes from 2 mm to 4 mm. Humidity levels don’t change as the month goes on, averaging around 76%. The average wind speed doesn’t change much during August, staying around 3 m/s. The good news is there are likely to be more sunny days in August, from 3 to 5.
September brings much the same weather, it remains good.
Wind
The average wind speed is 3 m/s getting up to 5 m/s which is a light breeze; barely moving the tree leaves.
The average wind speed in San Diego is gradually increasing during August, going from 2 m/s to 2 m/s over the course of the month.
Rain
How was the weather last August in San Diego?
Climate Change Over the Years
The climate in San Diego in August has not changed that much over the last 43 years.
The average temperature was the lowest in 2001 (+67°F) and the highest in 2014 (+74°F). The driest year was 2002 with only 156 mm of rainfall, and the wettest year was 2023 with 1311 mm.
FAQ
Is August a good time to visit San Diego?
Can you sunbathe in San Diego in August?
Can you swim in San Diego in August?
Is San Diego rainy in August?
Is it sunny in San Diego in August?
Other cities in USA
Monthly weather in San Diego
Source of the data
For this page, we’ve looked at the typical weather in San Diego, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.