San Francisco weather in September (California, United States of America)

How's the weather trend in San Francisco as September approaches? Curious if the timing is right for your trip? Our page offers an in-depth look at the monthly weather conditions.

Temperatures

For September, the weather in San Francisco is generally perfect, featuring high temperatures and almost no rainfall. Anticipate daytime temperatures around 23°C, while night temperatures can drop to 13°C. On average, it is the month with the highest temperature of the year.

Precipitation

San Francisco in September usually receives almost no rainfall, averaging around 3.4 mm for the month. Typically, you can expect about a single day of rain this month.

Average sunshine

There are approximately 270 hours of sunshine this month, meaning plenty of sunny days and a vibrant atmosphere.

If you're inclined towards comfortable temperatures and drier conditions, September is a prime time to visit San Francisco. May, June, July, August, September and October typically offer the best circumstances. While December tends to showcase less optimal conditions.

For an in-depth look at the yearly conditions, visit our specialized San Francisco climate page with graphs.

 

San Francisco, monthly averages in September

Min Temperature 13°C  

Max Temperature 23°C  

Water Temperature 14°C  

Chance of Rain 3%  

Precipitation 3.4 mm  

Rainy days a single day  

Humidity 73%  

Windspeed 18 km/h  

Sunshine 270 hours  

Percentage Sunshine 73%  

Where to go in the United States of America in September

Find out more about the weather in the United States of America and which places have the best travel conditions in this month.

Weather conditions Weather

Temperatures

Precipitation

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Legend perfect weather pleasant tolerable unpleasant poor

Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C and 29°C and not too much precipitation (less than 90 mm a month).

So, what should you wear in this month?

For visitors traveling to San Francisco, we recommend wearing layers. So maybe a skirt, t-shirt, shorts for during the day and jeans and a warm jacket for some days and evenings. With a water temperature of around 14°C there is no need to bring your swimwear.

What To Do

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Cycling

10/10

Walking

10/10

Barbeque

9/10

Camping

10/10

Outdoor sports

10/10

Interested in more climate information?

This site provides you with all the information you need about the climate in San Francisco.

Our site offers climate and forecast data for every country in the world. Are you going to the United States of America? On this website you can find historical weather averages for many cities in the United States of America. Not sure yet where to go? We now have a tool which recommends destinations that suit your ideal travel conditions. Find out where to go with our weather planner.