Half Moon Bay Weather in May

What's the weather like in Half Moon Bay (California) in May 2025?

The climate in Half Moon Bay during May can be summarized as mild and very dry.

May is in the spring in Half Moon Bay and is typically the 6th warmest month of the year. Daytime maximum temperatures average around 19°C (66°F), whilst at night 9°C (48°F) is normal.

Half Moon Bay weather averages (imperial / metric)
Daytime temperature 18.8°C 65.8°F
Nightly temperature 8.9°C 47.9°F
Average temperature 13.8°C 56.8°F
Daily sunshine 11.4 hrs
Avg rainfall 9 mm 0.4 ins
Rainy days 3 days
Sea temperature 11.8°C 53.2°F
Humidity 71%
Windspeed 20.5kph 13 mph

On average May is the 5th driest month of the year in Half Moon Bay with around 9mm 0.4 inches of rain making it a very dry time to visit.

On the flip side this corresponds to an average of 11.4 hours of sunshine per day.

May temperatures in Half Moon Bay

Half Moon Bay average temperature in May

May rainfall

Half Moon Bay average rain in May

May hourly sunshine

Half Moon Bay average rain in May

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 May 2025.

Other monthly averages

Best places to visit in May

UV index Best time to go?

Beta

Current (hourly) weather 15 day forecast

Half Moon Bay weather stats

Half Moon Bay weather statistics
Hottest month: September 22.5°C 72.5°F
Driest month: July 2mm 0.1ins
Sunniest month: April 11hrs
Coldest month: January 13.4°C 56.1°F
Wettest month: January 146mm 5.7ins
Map showing location of Half Moon Bay (37.46355, -122.42859) Half Moon Bay map pin © Google

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