Monthly climate guide
San Francisco weather in August
With highs near 23°C (74°F) and lows around 13°C (55°F), August feels warm in San Francisco. Rainfall averages about 1 mm (very dry) and the sky is often cloudy. Daytime highs are about the same as July and about the same as September.
What stands out in August
- August is San Francisco's second warmest month.
- Good walking weather for combining Alcatraz Island and Golden Gate Bridge in one day.
- Seasonally, August counts as late summer in San Francisco.
- It's one of the drier months, with about 98% less rain than San Francisco's average.
Avg high
23°C
74°F
Avg low
13°C
55°F
Rainfall
1 mm
very dry
Humidity
75%
relative
Sky
60%
cloud · often cloudy
San Francisco weather by month
Show the monthly averages as a table
| Month | Avg high | Avg low | Rain | Humidity | Cloud cover |
|---|---|---|---|---|---|
| January | 14°C / 57°F | 7°C / 44°F | 96 mm | 83% | 59% |
| February | 15°C / 59°F | 7°C / 45°F | 90 mm | 80% | 54% |
| March | 16°C / 60°F | 8°C / 47°F | 98 mm | 82% | 61% |
| April | 18°C / 64°F | 9°C / 48°F | 35 mm | 79% | 53% |
| May | 19°C / 66°F | 10°C / 50°F | 15 mm | 77% | 54% |
| June | 22°C / 72°F | 12°C / 53°F | 9 mm | 73% | 45% |
| July | 22°C / 72°F | 12°C / 54°F | 1 mm | 74% | 56% |
| August | 23°C / 74°F | 13°C / 55°F | 1 mm | 75% | 60% |
| September | 24°C / 76°F | 13°C / 56°F | 4 mm | 71% | 46% |
| October | 23°C / 73°F | 12°C / 54°F | 22 mm | 67% | 41% |
| November | 18°C / 64°F | 9°C / 48°F | 59 mm | 75% | 47% |
| December | 14°C / 57°F | 7°C / 44°F | 95 mm | 79% | 53% |
What to pack for August
- T-shirts plus a light layer for the evening
- Comfortable trainers or sandals for long walks
Is August a good time to visit San Francisco?
Our San Francisco guide recommends: September to November, when fog is less frequent and temperatures are at their warmest — summer here can be surprisingly cool and foggy.
Bring layers even in summer — Mark Twain's famous (if apocryphal) line about a cold San Francisco summer is closer to true than visitors expect.
Best time to visit San Francisco →Other United States cities in August
Cite or embed this data
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San Francisco weather in August. WeatherCompare, 2026 (NASA POWER / ERA5, 2011–2020 monthly averages). https://weathercompare.eu/weather/usa/san-francisco/august
<a href="https://weathercompare.eu/weather/usa/san-francisco/august">San Francisco weather in August</a> (WeatherCompare)
<iframe src="https://weathercompare.eu/embed/usa/san-francisco" width="300" height="160" style="border:0;border-radius:12px" loading="lazy" title="San Francisco weather in August"></iframe> <p style="font-size:12px"><a href="https://weathercompare.eu/weather/usa/san-francisco/august">San Francisco weather in August</a> – WeatherCompare</p>
San Francisco in August: quick answers
Is August a good time to visit San Francisco?
August is a reasonable time for San Francisco: highs around 23°C and about 1 mm of rain, though not one of the three best months.
How warm is San Francisco in August?
Average highs are about 23°C (74°F) and average lows about 13°C (55°F), based on 10 years of daily data.
Does it rain a lot in San Francisco in August?
San Francisco typically gets around 1 mm of rain in August — very dry.
When is the best time to visit San Francisco?
September to November, when fog is less frequent and temperatures are at their warmest — summer here can be surprisingly cool and foggy.
Figures are long-term averages for the area around San Francisco (NASA POWER / ERA5, 2011–2020), not a forecast for a specific year. For upcoming days, see the live multi-source forecast.