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

Planning a trip to San Diego in September? Here's what the weather might have in store during this month.

In San Diego the weather in September is generally perfect, with high temperatures and almost no rainfall. Anticipate daytime temperatures around 26°C, while night temperatures can drop to 18°C. Typically, it's the hottest month of the year. Make sure to come prepared with breezy outfits. Whether you're out exploring or just lounging, being prepared can make your experience in this warm month much more enjoyable.

San Diego in September usually receives almost no rainfall, averaging around 4.3 mm for the month. Typically around 1 day of rainfall is expected.

The city usually sees around 253 hours of sunlight, indicating many sunny days.

If you're inclined towards comfortable temperatures and drier conditions, September is a prime time to visit San Diego. January, February, March, April, May, June, July, August, September, October and November 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 Diego climate page with graphs.

 

San Diego, monthly averages in September

Min Temperature 18°C  
Max Temperature 26°C  
Chance of Rain 3%  
Precipitation 4.3 mm  
Rainy days 1 day  
Humidity 74%  
Sunshine 253 hours  
Percentage Sunshine 68%  

Where to go in the United States of America in September

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

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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 San Diego in September?

It's going to be warm! Consider airy clothing, t-shirts, and other summer clothes. Shorts for men made of cotton or linen are good options for staying cool.

What To Do

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

Swimming
10/10
Cycling
8/10
Walking
8/10
Barbeque
10/10
Camping
10/10
Outdoor sports
8/10

Interested in more climate information?

Weather and Climate provides you with all the information you need about the climate in San Diego.

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 climate conditions. Find out where to go with our weather planner.