Temperatures in August
It's hot in August in San Francisco with an average temperature of 32°C. Temperatures this month range from a low of 31°C to a high of 33°C. At night, you can expect temperatures between 20°C and 21°C.
Max and Min Temperatures per Day
This chart shows the daily maximum and minimum temperatures in degrees Celsius for San Francisco in August. The red line indicates the max temperatures, and the blue line shows the minimums.
Start of August
The month of August starts in San Francisco with hot temperatures, averaging around 33°C during the day and nights close to 21°C. Plenty of days with a chance of precipitation.
Mid-August
By mid-August, the average daytime temperature stays the same at 33°C, with nights close to 21°C. The chance of precipitation is high during this period.
End of August
By the end of August, the average daytime temperature in San Francisco will be around 32°C, with nights close to 21°C. There’s a significant chance of many days with precipitation.
Precipitation in August
In August, there is an average of 412 mm of precipitation, spread over 22 days. The wind speed is around 3 Bft, mostly coming from the East.
There’s an average 72% chance of precipitation per day this month. Though that seems frequent, there are also a few days with lower precipitation chances.
Precipitation Chance
This chart shows the daily precipitation chance (in percentages) in August for San Francisco. 0% means it never rained on that day in the past 10 years, and 100% means it rained every day. All values in between represent the average chance of precipitation on that day.
San Francisco in August |
London | ||
|---|---|---|---|
 Average Temperature |
32°C | 22°C | |
 High Temp |
33°C | 24°C | |
| Low Temp |
31°C | 19°C | |
 Total Precipitation |
412 mm | 60 mm | |
| Rainy Days |
22 days | 10 days | |
July
UV index
The UV index is a maximum of 9 this month. That's a very high value on the intensity scale of 1 to 11. Unprotected skin can burn within 10-15 minutes.
Is August a good time to visit San Francisco?
After some sun? Then August isn’t the best time to be in San Francisco. The temperature is pleasant, but there’s too much chance of rain this month.
The hurricane season in San Francisco runs from June to November.
Temperature records for San Francisco in August
With 36°C, San Francisco hit the highest temperature in the last 10 years in August 2021. The lowest daytime temperature in this month was 26°C in 2020. The extreme night temperatures ranged from a low of 17°C to a high of 24°C.
Check out the climate of San Francisco for all months and discover the best travel time
Daily Temperature in August in San Francisco
This chart shows the average daily temperatures, both day and night, for each day in August in San Francisco, measured in degrees Celsius. The red line represents the maximum temperatures, while the blue line shows the minimums. The days of the month are displayed at the bottom of the chart. The data, based on historical observations, gives an overview of the average daily temperatures during this month.
Daily Precipitation in August in San Francisco
The chart below shows the average daily precipitation in August for San Francisco, measured in millimetres over the past years. Precipitation is always measured as water, even if it’s snow or hail. The days of the month are shown at the bottom of the chart.
A low average precipitation means that the chance of rain on that day is usually small, while a higher average suggests that rain is more likely. But it’s still an average, so each day can be different. Based on historical weather data for August, you can expect around 22 days of rain in San Francisco.
Daily UV Index in August in San Francisco
This chart shows the average daily UV index in August in San Francisco, with the UV index ranging from 0 to a maximum of 11. The bottom of the chart shows the days of the month. Based on historical data, this chart provides an idea of the daily UV radiation levels you can expect.
Temperature in August in San Francisco Over the Years
This chart shows the average temperature in August in San Francisco, measured in degrees Celsius, over the past years.
Total Precipitation in August in San Francisco Over the Years
This chart shows the average precipitation in August in San Francisco, measured in millimetres over the past years. Precipitation is always measured as water, even if it’s snow or hail.
Daily climate in August for San Francisco
Click on a specific day in August for detailed info on the typical weather on that day in San Francisco. Check out the historical temperatures and precipitation over the past 10 years on this day.
Weather experiences in August in San Francisco
Have you been to San Francisco in August?
Share your weather experience in August in San Francisco.
Average Weather in San Francisco by Month
Click on a month below to see detailed weather info for San Francisco. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.
Or check out the climate of San Francisco for all months at once
