August · United States
Best time to visit San Francisco in August Weather, crowds & prices
Weather in San Francisco in August
Average temperature 18°C, 1 mm of rain, about 30 days with 6+ hours of sunshine and 73% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
August score
9.7/10
Ranked #3 of 12 months
- Avg temp
- 18°C
- Rainfall
- 1 mm
- Humidity
- 73%
- Days with 6h+ sun
- 30
- Crowd Density
- Peak Tourist Rush
- Average Expenses
- $$$ · Peak Season Rates ($$$)
August in San Francisco scores 9.7/10 for sightseeing and cultural travel - one of the top 12-month picks (#3). Expect around 18°C, 1 mm of rain, and roughly 30 days with 6+ hours of sunshine this month.
Fog-kissed hills, bridges, and bay walks at their most pleasant from April through June.
August in San Francisco — one of the year's strongest windows (3rd)
Temperatures hover around 18°C (65°F) — the kind of month where neither heat nor cold forces the schedule.
At just 1 mm for the month, rain will not shape your plans; you get about 30 days with 6+ hours of sunshine and 13.5 hours of daylight.
On our climate-comfort scale this is one of the strongest months of the year for San Francisco at 9.7/10 (3rd of 12), just behind July at 9.8/10.
Pack layers you can shed by midday plus one warm layer for the evening.
Budget for peak pricing, and this is one of the busiest months here. You are paying the year's highest rates for the year's best conditions — book early or shift a few weeks either side.
Frequently asked
- What is the weather like in San Francisco in August?
- In August, San Francisco averages 18°C, 1 mm of rain, and about 30 days with 6+ hours of sunshine. Its climate-comfort score is 9.7/10.
- Is August a good time to visit San Francisco?
- August earns a 9.7/10 climate-comfort score. Use the year-round chart to weigh the weather against your budget and crowd preferences.
- How much does it rain in San Francisco in August?
- Expect about 1 mm of rain in August. Average humidity is 73% and there are about 30 days with 6+ hours of sunshine.
Curated in San Francisco
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San Francisco, United States. Live activities and tours from GetYourGuide, matched to this destination.