Foster City weather in September (California, United States of America)

What kind of temperatures can you expect in Foster City during September? Our page offers a comprehensive look at the weather you can expect this month.

Temperatures

Expect perfect weather in Foster City during September, which means high temperatures and almost no rainfall. The daytime often sees temperatures reaching 24°C, but nighttime brings a cool-down to 13°C. On average, it sees the highest temps of the year.

Precipitation

Foster City in September usually receives almost no rainfall, averaging around 3.5 mm for the month. Typically, you can expect about 1 day of rain this month.

Average sunshine

With approximately 270 hours hours of sun, the days are filled with brightness. It makes it a perfect month for outdoor activities.

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

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

 

Foster City, monthly averages in September

Min Temperature 13°C  

Max Temperature 24°C  

Water Temperature 14°C *  

Chance of Rain 3%  

Precipitation 3.5 mm  

Rainy days 1 day  

Humidity 73% *  

Windspeed 18 km/h *  

Sunshine 270 hours *  

Percentage Sunshine 73% *  

* Data from: San Francisco, the United States of America (11 KM, 7 Miles).

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 Foster City, 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.

Swimming

10/10

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 Foster City.

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.