San Diego · August
Run in the morning.
Comfortable average high of 78°F, dipping to 66°F at night. Humidity averages 78% — the limiting factor on most runs. Dry month — only 2 measurable rain days on average. Humidity rises with the sun — morning runs catch the driest, coolest window.
Avg high / low
78° / 66°F
Humidity
78%
Rain days
2/mo
Wind
11 mph
What August feels like in San Diego
Sunrise
06:12
Mid-month average
Sunset
19:31
Mid-month average
Time-of-day breakdown
Morning
Coolest, driest air of the day. The window before sunrise is the most reliable comfortable hour.
Midday
Mild but UV and traffic peak. Workable if you don't mind shifting your pace.
Evening
Warm and runnable. Crowded routes but the air's typically calm.
What to wear running in San Diego in August
The kit for August in San Diego: shorts and a short-sleeve are the standard kit.
August vs the surrounding months
vs July
+2° avg high
+1 rain days
San Diego in July →
August
78°F avg high
2 rain days
Best: morning
vs September
0° avg high
-1 rain days
San Diego in September →
Frequently Asked Questions
What is the best time of day to run in San Diego in August?+
Morning. Humidity rises with the sun — morning runs catch the driest, coolest window.
What's the average temperature in San Diego in August?+
Average high 78°F, average low 66°F.
How does August compare to surrounding months in San Diego?+
Compared to July (avg high 76°F), August is warmer. Compared to September (avg high 78°F), August is cooler.
Does it rain often in San Diego in August?+
Expect about 2 measurable rain days in August, on average.