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

Can you expect sunny skies in San Mateo in September? Use this page to get an overview of the month’s weather conditions.

Temperatures

The weather in San Mateo during September is typically perfect, with high temperatures and almost no rainfall. Expect daytime highs to reach approximately 24°C, with nighttime lows dipping to around 13°C. On average, it sees the highest temps of the year.

Precipitation

San Mateo in September usually receives almost no rainfall, averaging around 3.5 mm for the month. Climate statistics over the past 30 years suggest around a single day of rain.

Average sunshine

Expect sunny days throughout the month, with an estimated 270 hours of sunshine. Making it a pleasant time to visit San Mateo.

So this is a great month to visit if you prefer dry days with pleasant temperatures. May, June, July, August, September and October typically offer the most optimal weather. In contrast, January, February and December tend to have less optimal conditions.

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

 

San Mateo, 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 a single day  

Humidity 73% *  

Windspeed 18 km/h *  

Sunshine 270 hours *  

Percentage Sunshine 73% *  

Data from: San Francisco, the United States of America (10 KM, 6 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 San Mateo, 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 San Mateo.

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.