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Best
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Best
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15°
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15°
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15°
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15°
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17°
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18°
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18°
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20°
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20°
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18°
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16°
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15°
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The annual average maximum daily temperature is 15.7°C (60.2°F) which is a little too chilly for sunbathing. The annual average water temperature is typically 16.7°C (62.1°F) which is cool for swimming, shorty wetsuit may help you extend your time in the water. Annually there are on average 7.5 days of rain per month and 8.3 hours of sun per day.
The best months to visit San Mateo County are June, July, August, September, for the best beach weather, the most sunshine and optimal sunbathing and swimming conditions with the least chance of rain.
The sea is best for swimming between May and October when the sea temperature is above the average 17°C (62°F) which is cool for swimming, shorty wetsuit may help you extend your time in the water.
No, you can't sunbathe in San Mateo County all year round. Some months are too cold for sunbathing, however you might enjoy other beach activities such as taking a walk, going hiking along trails or just enjoying the scenery.
Even during the warmest month, sunbathing may not be ideal as temperatures don't reach 20°C (72°F). The warmest month in San Mateo County is October when the average maximum temperature is 18°C (65°F), average temperature is 14°C (56°F) and average minimum temperature is 10°C (49°F).
More info about the annual temperatures and sunshine.
No, you can't swim in San Mateo County all year round.
The warmest sea water temperatures in San Mateo County are found in September when they peak at 20°C (68°F) and lowest in February when they dip to 15°C (59°F).
The sea temperature is above average for swimming between May and October when the sea temperature is above 17°C (62°F) which is cool for swimming, shorty wetsuit may help you extend your time in the water.
The sea is good for swimming in the months from August to September when the sea temperature is above 19°C (66°F)
More info about the annual sea temperatures
The hottest month in San Mateo County is October when the average maximum temperature is not that warm but sunbathing may be possible on some clear days 18°C (65°F), average temperature is 14°C (56°F) and average minimum temperature is 10°C (49°F).
More info about the annual temperatures and sunshine.
The coolest month in San Mateo County is January when the average maximum temperature is 15°C (59°F), average temperature is 10°C (51°F) and average minimum temperature is 6°C (42°F).
More info about the annual temperatures and sunshine
The driest month in San Mateo County is July with 0.1cm (0.0inches) of rain and the least days of rain with 2.4 days with some rain, a very dry time to visit the beach.
More info about the annual rainfall
The coldest sea water temperatures in San Mateo County are found in February when they dip to 15°C (59°F) which is cold for swimming, a full wet suit is required to spend any length of time in the sea.
More info about the annual sea temperatures.
The warmest sea water temperatures in San Mateo County are found in September when they peak at 20°C (68°F) which is comfortable for swimming though some may prefer warmer water.
More info about the annual sea temperatures.
The most humid month in San Mateo County is September with a dew point (an indicator of humidity) of 14°C (58°F) which is comfortable for everyone.
More info about the annual humidity.
The least humid month in San Mateo County is January with a dew point of 9°C (49°F) which is a bit dry for some.
More info about the annual humidity.
The most windy month in San Mateo County is April when the average maximum windspeed is 29KM/H (18MPH) and the average wind speed is 14KM/H (8MPH).
More info about the annual wind conditions.
The hottest month in San Mateo County is October when the average maximum temperature is 18°C (65°F), average temperature is 14°C (56°F) and average minimum temperature is 10°C (49°F).
The coolest month in San Mateo County is January when the average maximum temperature is 15°C (15°F), average temperature is 10°C (51°F) and average minimum temperature is 6°C (42°F).
The longest days in San Mateo County are in June, with an average of 14.7 hours of daylight per day. December has the shortest days with an average of 9.6 hours of daylight per day.
The sunniest days in San Mateo County are in June which has the most hours of sunshine per day. The sunshine percentage is 75% making it sunny and pleasant most of the time. The hours of sunshine per day are 11.1hrs making the days very long and bright.
December has the least sunshine. The sunshine percentage is 54% making it quite sunny but with occasional periods of cloudy and overcast skies. There are 5.2 hours of sunshine per day.
The ultraviolet index is the highest in July when it reaches 10.7 and lowest in December when it reaches 2.3.
An ultraviolet index reading of 8 to 10 indicates a very high risk of harm from unprotected sun exposure. Unprotected skin risks burning in less than 15 minutes. Take extra precautions because unprotected skin and eyes will be damaged and can burn quickly. Tanning will be safest before 10am and after 4pm but only with a good application of sun screen. For those with sensitive skin stay in the shade and wear protective clothing, a wide-brimmed hat, and UV-blocking sunglasses. Generously apply broad spectrum SPF 30+ sunscreen every 2 hours, even on cloudy days. Watch out for relections from water that may increase ultraviolet exposure.
The warmest sea water temperatures in San Mateo County are found in September when they peak at 20°C (68°F) and lowest in February when they dip to 15°C (59°F).
The sea is best for swimming between May and October when the temperature is above 17°C (62°F) which is cool for swimming, shorty wetsuit may help you extend your time in the water.
The wettest month in San Mateo County is December with 7.2cm (2.8inches) of rain and March has the most days of rain with 13.6 days with some rain, a pretty wet time to visit the beach.
The driest month in San Mateo County is July with 0.1cm (0.0inches) of rain and the least days of rain with 2.4 days with some rain, a very dry time to visit the beach.
Beaches recommended for you today, this weekend, in the next 2 weeks or in any month of the year.
Beaches recommended for you today, this weekend, in the next 2 weeks or in any month of the year.
