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

What can you expect from the weather in San Mateo during September? Wondering if it's the right time to visit? Browse this page for a comprehensive overview of the weather conditions for that month.

In San Mateo the weather in September is generally perfect, with high temperatures and almost no rainfall. Anticipate daytime temperatures around 24°C, while night temperatures can drop to 13°C. On average, it sees the highest temps of the year.

San Mateo in September usually receives almost no rainfall, averaging around 3.5 mm for the month. When we look at the climate data from the last 30 years, we can expect around 1 day of rain.

The city usually sees around 270 hours of sunlight, indicating many sunny days.

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 1 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 in September and which places have the best weather 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 San Mateo in September?

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 in September.

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