San Francisco · August
Run in the morning.
Cool month: average high 68°F, low 58°F. Humidity averages 80% — the limiting factor on most runs. Dry month — only 0 measurable rain days on average. Cool, runnable conditions throughout — morning still has the steadiest air and lightest wind.
Avg high / low
68° / 58°F
Humidity
80%
Rain days
0/mo
Wind
16 mph
What August feels like in San Francisco
Sunrise
06:26
Mid-month average
Sunset
20:00
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 Francisco in August
The kit for August in San Francisco: shorts and a short-sleeve are the standard kit, a wind-blocking layer for exposed routes.
August vs the surrounding months
vs July
+1° avg high
0 rain days
San Francisco in July →
August
68°F avg high
0 rain days
Best: morning
vs September
-2° avg high
-2 rain days
San Francisco in September →
Frequently Asked Questions
What is the best time of day to run in San Francisco in August?+
Morning. Cool, runnable conditions throughout — morning still has the steadiest air and lightest wind.
What's the average temperature in San Francisco in August?+
Average high 68°F, average low 58°F.
How does August compare to surrounding months in San Francisco?+
Compared to July (avg high 67°F), August is warmer. Compared to September (avg high 71°F), August is cooler.
Does it rain often in San Francisco in August?+
Expect about 0 measurable rain days in August, on average.