Weather in San Francisco in August 2025
- August is usually the wettest month of the year in San Francisco;
Average weather
Average temperature in San Francisco in August
Going from a maximum of +86°F during the day to a minimum of +57°F during the night, the temperature in August averages around +77°F.
The average maximum temperature goes up 50% by the end of the month, compared with the beginning of the month, from +72°F to +86°F.
Is San Francisco warm or cold in August?
San Francisco is typically warm in August.
Maximum temperatures go up compared to the previous month from +73°F to +75°F. The minimum temperature also goes up from +55°F to +57°F.
It’s generally warm, but pack a long-sleeve shirt for evenings.
August is one of the warmest months in San Francisco, here is the comparison with other months:
Water temperature in San Francisco in August
Water in San Francisco in August is Cold. It varies from +54°F to +59°F, with an average of +56°F. The air temperature averaging +75°F is higher than the water temperature.
The water temperature in August is one of the warmest of the entire year:
Can you swim in San Francisco in August?
Climate in San Francisco in August
| July | August | September | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +73°F | +75°F | +75°F | ||||
| Min. temperature | ||||||
| +50°F | +50°F | +48°F | ||||
| Max. temperature | ||||||
| +95°F | +93°F | +99°F | ||||
| Rainfall | ||||||
| 0 mm | 1 mm | 4 mm | ||||
| Wind | ||||||
| 3 m/s | 2 m/s | 2 m/s | ||||
| Avg. water temperature | ||||||
| +55°F | +56°F | +57°F | ||||
| Humidity | ||||||
| 82% | 83% | 81% | ||||
| Air pressure | ||||||
| 1013 HPa | 1013 HPa | 1012 HPa | ||||
| Sunny days | ||||||
| 7 | 6 | 9 | ||||
| Cloudy days | ||||||
| 23 | 24 | 19 | ||||
| Rainy days | ||||||
| 0 | 0 | 2 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
August weather is still as good as in July. It’s getting warmer as August arrives. The average maximum temperature goes up from +73°F to +75°F during the day. Prepare for more rain. Average rainfall goes from 0 mm to 1 mm. Humidity rises from 82% to 83%. Winds are calmer in comparison to July, going down from 3 m/s to 2 m/s on average. The days becoming less sunny, going from 7 sunny days in July to 6 in August.
September brings much the same weather, it remains good.
Wind
The average wind speed is 1 m/s getting up to 2 m/s which is a light breeze; barely moving the tree leaves.
The average wind speed in San Francisco is gradually increasing during August, going from 1 m/s to 2 m/s over the course of the month.
Rain
How was the weather last August in San Francisco?
Climate Change Over the Years
The climate in San Francisco in August has not changed that much over the last 43 years.
The average temperature was the lowest in 1982 (+65°F) and the highest in 2014 (+70°F). The driest year was 2013 with only 127 mm of rainfall, and the wettest year was 1983 with 1162 mm.
FAQ
Is August a good time to visit San Francisco?
Can you sunbathe in San Francisco in August?
Can you swim in San Francisco in August?
Is San Francisco rainy in August?
Is it sunny in San Francisco in August?
Other cities in USA
Monthly weather in San Francisco
Source of the data
For this page, we’ve looked at the typical weather in San Francisco, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.