Hottest (avg)
#2 / 12
San Francisco in August
August weather, climate averages, and packing tips.
Avg High
Avg Low
Rain
Daylight 14h
What to expect
As summer continues, August brings, where the weather is warming up. Daytime highs average 21°C / 70°F, dropping to 13°C / 56°F at night.
It is one of the drier times of year, though occasional showers are still possible. The sun is very strong at this time of year, making sun protection essential during the day.
August in context
How it compares to the rest of the year in San Francisco.
Wettest (avg)
#2 / 12
Daylight Hours
#4 / 12
Windiest (avg)
#6 / 12
Highest UV
#4 / 12
Most Humid
#6 / 12
Temperature
- Daytime high
-
- Nighttime low
-
- Feels like (avg)
-
Sunshine
- Daylight
- 13.6 hours
- UV index (max)
- 8
- Typical sun hours
- 05:25 – 19:00
Rain & Snow
- Total
-
- Rainy days
- 0
- Cloud cover
- 43%
- Snowfall
-
Humidity & Wind
- Humidity (avg)
- 78%
- Wind (avg)
-
- Wind (max gusts)
-
Frequently asked questions
Is August a good time to visit San Francisco?
Typical August days in San Francisco reach highs of 21°C (70°F) with nights around 13°C (55°F). It usually feels mild by day and cool after dark. It is one of the drier months, which suits outdoor exploring and sightseeing.
What are temperatures like in August?
In August, you can usually expect highs of 21°C (70°F) and lows near 13°C (55°F). That means mild days and cool nights, so pack layers you can add or remove.
How much does it rain in August?
Rainfall in August averages 1 mm (0.04 in) across roughly 0 days. Overall it is a mostly dry time of year, so showers are usually brief rather than all-day downpours.
How many hours of daylight are there in August?
You can expect about 14 hours of daylight in August. Sunrise is typically around 05:25 and sunset near 19:00. You get long days with comfortable amounts of daylight.
How strong is the sun in August?
UV levels frequently reach very high levels (around 8), so strong sun protection is essential, especially around midday.
Is it windy in August?
In August, average wind speeds are around 15 km/h (9 mph), with gusts on the windiest days reaching about 53 km/h (33 mph). On the ground, it is it can feel quite windy at times, particularly when weather systems move through.