San Francisco weather in August
San Francisco in August averages 18°C (65°F) and 1 mm of rain. It is one of the driest months of the year here.
Of the twelve months in San Francisco, August is the second warmest and the second driest.
- Average temp
- 18°C (65°F)
14–23°C · 57–73°F
- Rainfall
- 1 mm
Not much rain
- Sunshine
- —
- Wind
- 20 km/h
What is San Francisco like in August?
Daytime
Days are mild.
Rain
Rain is usually light.
Evening
Evenings are cooler. A layer helps after sunset.
What should I pack for San Francisco in August?
A layer for the evening
Evenings cool off noticeably once the sun is down.
August compared with July and September
August in San Francisco is 0.5°C warmer than July and about as wet as it, which averages 18°C (64°F).
August in San Francisco is about the same temperature as September and about as wet as it, which averages 18°C (65°F).
Daylight in San Francisco in August
On 15 August the sun is up for 13 hours 36 minutes in San Francisco, rising about 06:25 and setting about 20:01 local time.
August ends 1 hour 4 minutes shorter than it begins, so the last week of the month is a different length of day from the first.
That is 1 hour 10 minutes short of June, the longest-lit month here.
Where to stay in San Francisco
Dates are a starting point for August.
Travel guides for San Francisco
What to read before you book.
San Francisco weather by month
TemperatureRainfall
How August compares with the rest of the year
August is highlighted. Every other month links to its own page.
| Month | Average | Rainfall |
|---|---|---|
| January | 11°C / 51°F | 99 mm |
| February | 12°C / 53°F | 100 mm |
| March | 13°C / 55°F | 69 mm |
| April | 14°C / 57°F | 35 mm |
| May | 15°C / 60°F | 13 mm |
| June | 17°C / 62°F | 4 mm |
| July | 18°C / 64°F | 0 mm |
| August | 18°C / 65°F | 1 mm |
| September | 18°C / 65°F | 2 mm |
| October | 17°C / 63°F | 19 mm |
| November | 13°C / 56°F | 50 mm |
| December | 11°C / 51°F | 106 mm |
Check another month
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FAQs about San Francisco in August
August climate averages for San Francisco, 1991–2020.
San Francisco averages 18°C (65°F) in August, ranging from about 14°C (57°F) at night to 23°C (73°F) in the afternoon. That is a 1991–2020 average, so an individual week can run either side of it.
Barely. August sees only about 1 mm, so rain is unlikely to affect your plans.
They are about the same. August averages 18°C (65°F) and September 18°C (65°F), so temperature alone will not decide between them.
August is 0.5°C warmer than July, and about as wet.
Yes. August falls inside the most comfortable stretch of the year here, May to October, on temperature and rainfall together.
This page does not show today's weather. It is a 1991–2020 climate normal from Meteostat — a long-run average of what August is usually like, which is what you want when booking months ahead. For today or the coming week, check a live forecast.
About 13 hours 36 minutes of daylight in mid-August, against 14 hours 46 minutes in June and 9 hours 34 minutes in December.
On 15 August, sunrise is about 06:25 and sunset about 20:01 local time. Both shift across the month — the month ends 1 hour 4 minutes shorter than it starts.
