Half Moon Bay Weather in October

The climate in Half Moon Bay during October can be summarized as mild and reasonably dry.

October is in the fall / autumn in Half Moon Bay and is typically the 5th warmest month of the year. Daytime maximum temperatures average around 21°C (70°F), whilst at night 10°C (50°F) is normal.

On average October is the 6th driest month of the year in Half Moon Bay with around 38mm 1.5 inches of rain making it a reasonably dry time to visit. This rainfall is typically spread over 4 days, although this may vary considerably.

On the flip side this corresponds to an average of 8.8 hours of sunshine per day.

The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Half Moon Bay in October 2025.