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San Francisco in August
The weather in August
In August, San Francisco averages daytime highs of 70° and night-time lows of 55° — mild weather by day. Expect around 0.1 in of precipitation, with hardly any wet days, with average cloud cover near 25%.
Temperatures are much the same as in July, and September brings little change. The sea averages 58°, too cold for most swimmers.
August scores 100/100 — excellent conditions for sightseeing — and ranks 1st of the twelve months for San Francisco.
Around the middle of the month the sun rises at 06:26 and sets at 20:04 local time, giving 13 h 38 min of daylight. Days shorten by 64 minutes over the month.
Why 100/100?
How the score for August is builtBeach score this month: 47/100 (adds sea temperature and heat).
Comfort peaks for daytime highs between 18° and 25°C (64–77°F).
Festivals in the region in August
- Old Spanish DaysSanta Barbara
Only the month is given: the exact dates change from year to year.
Around San Francisco this month
San Rafael
Richmond
United States's best in August
Salinas
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Coos Bay
North Bend
San Francisco in August: quick answers
Is August a good time to visit San Francisco?
August scores 100/100 for San Francisco, which we rate as excellent. Average highs are 70°F with 0 wet days.
How warm is San Francisco in August?
Daytime highs average 70°F and night-time lows 55°F in August.
Does it rain a lot in San Francisco in August?
San Francisco receives about 0.1 in of precipitation in August, falling on around 0 days.
Can you swim in San Francisco in August?
The sea averages 58°F in August, cold for most swimmers.