What to pack for San Francisco in August
- long sleeves and a warm layer
- a medium jacket
Humidity averages 81%; max daily wind around 30 km/h.
How August compares
Best months in San Francisco: April–October. See the full best time to visit San Francisco guide.
San Francisco in August: the details
In August, San Francisco sees average daytime highs of 20°C (68°F) and overnight lows of 14°C (58°F). Rainfall totals roughly 1 mm across 0.3 rainy days, and the sun shines about 12.2 hours per day with 13.5 hours of daylight mid-month. Relative humidity averages 81%.
In context: August is the third-warmest month and the 11th-wettest in San Francisco. The sunniest month is June (13.2 h/day).
| Metric | August average |
|---|---|
| Daytime high | 20°C / 68°F |
| Overnight low | 14°C / 58°F |
| Rainfall | 1 mm over 0.3 rainy days |
| Sunshine | 12.2 h/day (13.5 h daylight) |
| Humidity | 81% |
| Travel score | 10.0 / 10 |
These figures are climate normals computed from the ERA5 weather reanalysis (2019–2024) for San Francisco, United States (37.77, -122.42) — see our methodology. Actual conditions vary year to year.
Not set on San Francisco? Browse the best places to visit in August ranked by travel score.
Frequently asked questions
How hot is San Francisco in August?
Daytime highs in San Francisco in August average 20°C (68°F); nights drop to about 14°C.
Does it rain in San Francisco in August?
Expect around 0.3 rainy days and 1 mm of rainfall in August.
Is August a good time to visit San Francisco?
August is one of the best months to visit San Francisco. Overall travel score: 10.0/10. The best months are April–October.
Also good in August, near San Francisco
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