Half Moon Bay weather in September (California, United States of America)

Will it be warm or cold in Half Moon Bay this September? Thinking about a visit? Explore this page for a full overview of the weather conditions this month.

Temperatures

The weather in Half Moon Bay during September is typically perfect, with high temperatures and low rainfall. You can expect daytime temperatures to reach around 22°C, while the nights will see a decline to about 11°C. On average, it has the peak temperatures of the year.

Precipitation

Half Moon Bay in September usually receives low rainfall, averaging around 5.6 mm for the month. Analyzing past climate data, one can expect approximately 3 days of rain.

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 a fan of comfortable temperatures and drier conditions, September is a great time to visit. May, June, July, August, September and October generally stand out with the best circumstances. While February, March and December tend to showcase less optimal conditions.

For an in-depth look at the yearly conditions, visit our specialized Half Moon Bay climate page with graphs.

 

Half Moon Bay, monthly averages in September

Min Temperature 11°C  

Max Temperature 22°C  

Water Temperature 14°C *  

Chance of Rain 10%  

Precipitation 5.6 mm  

Rainy days 3 days  

Humidity 73% *  

Windspeed 18 km/h *  

Sunshine 270 hours *  

Percentage Sunshine 73% *  

Data from: San Francisco, the United States of America (17 KM, 10 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 Half Moon Bay, 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.

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 Half Moon Bay.

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.