Avg High
San Diego in August
Verdict
In San Diego, August has a distinct summer feel. As the season moves along, the weather is warming up. You can usually expect a warm month that feels reliable day to day. The atmosphere is generally sunny and dry, perfect for uninterrupted outdoor plans.
Well suited to visitors who prefer a steady feel over dramatic shifts. Shade breaks make a noticeable difference on longer outdoor days.
Avg Low
Rain
Daylight
13h
What to expect
- Temperature feel - Summer-like warmth with evenings that feel distinctly cooler. Direct sun can push it into “hotter than expected” territory.
- Wet weather - Very little rain. It’s often more stop-start than all-day. You’ll usually get away without rain gear.
- Midday sun - Very high UV is common. Outdoor time is best in the morning or late afternoon. It's the kind of sun you notice immediately.
- Exposure - Refreshing breezes, and gusts can catch you in exposed spots. Sheltered streets can feel fine, but open areas feel very different.
August in context
How it compares to the rest of the year in San Diego.
Hottest (avg)
#1 / 12
Wettest (avg)
#10 / 12
Daylight Hours
#4 / 12
Windiest (avg)
#7 / 12
Highest UV
#4 / 12
Most Humid
#1 / 12
Temperature
- Daytime high
-
- Nighttime low
-
- Feels like (avg)
-
Sunshine
- Daylight
- 13.3 hours
- UV index (max)
- 8
- Typical sun hours
- 05:12 – 18:31
Rain & Snow
- Total
-
- Rainy days
- 1
- Cloud cover
- 25%
- Snowfall
-
Humidity & Wind
- Humidity (avg)
- 78%
- Wind (avg)
-
- Wind (max gusts)
-
Frequently asked questions
Is August a good time to visit San Diego?
Typical August days in San Diego reach highs of 25°C (77°F) with nights around 18°C (64°F). It usually feels warm by day and mild after dark. It is one of the drier months, which suits outdoor exploring and sightseeing.
What are temperatures like in August?
In August, you can usually expect highs of 25°C (77°F) and lows near 18°C (64°F). That means warm days and mild nights, so pack layers you can add or remove.
How much does it rain in August?
Rainfall in August averages 3 mm (0.12 in) across roughly 1 days. Overall it is a mostly dry time of year, so showers are usually brief rather than all-day downpours.
How many hours of daylight are there in August?
You can expect about 13 hours of daylight in August. Sunrise is typically around 05:12 and sunset near 18:31. You get long days with comfortable amounts of daylight.
How strong is the sun in August?
UV levels frequently reach very high levels (around 8), so strong sun protection is essential, especially around midday.
Is it windy in August?
In August, average wind speeds are around 9 km/h (6 mph), with gusts on the windiest days reaching about 37 km/h (23 mph). On the ground, it is a gentle to moderate breeze is common, but stronger winds are not frequent.