Castro Valley weather in September (California, United States of America)

Will it be warm or cold in Castro Valley this September? Wondering about the weather this month? Our guide has all the details you need.

Temperatures

You’ll find the weather in Castro Valley during September to be perfect, with high temperatures and almost no rainfall. September marks the summer season. In the daytime, temperatures tend to hover near 25°C, cooling down at night to around 13°C. On average, it is the month with the highest temperature of the year.

Precipitation

Castro Valley in September usually receives almost no rainfall, averaging around 4.2 mm for the month. Delving into the climate records from the past 30 years, one can predict that nearly a single day of the month will see rainfall.

Average sunshine

With around 270 hours of sunshine, the days are mostly sunny. It gives a pleasant and vibrant feel to the area.

If you're inclined towards comfortable temperatures and drier conditions, September is a prime time to visit Castro Valley. 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 Castro Valley climate page with graphs.

 

Castro Valley, monthly averages in September

Min Temperature 13°C  

Max Temperature 25°C  

Chance of Rain 3%  

Precipitation 4.2 mm  

Rainy days a single day  

Humidity 73% *  

Sunshine 270 hours *  

Percentage Sunshine 73% *  

Data from: San Francisco, the United States of America (27 KM, 17 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 Castro Valley, 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.

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 Castro Valley.

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.