San Mateo
California, USA
Long-term weather forecast
Long-term weather forecast

Monthly weather forecast and climate
San Mateo, CA

A unique breathtaking view of the scenic spot of the Devil
A unique breathtaking view of the scenic spot of the Devil's Slide Sheer Cliff over the pacific Coast in San Mateo, California, cute flowers and blue sky
January, like December, is a moderate winter month in San Mateo, California, with average temperature fluctuating between 56.8°F (13.8°C) and 46.9°F (8.3°C). In January, the average high-temperature is practically the same as in December - a still mild 56.8°F (13.8°C). Weather in January »

February, the last month of the winter, in San Mateo, is also a moderate month, with average temperature varying between 57.7°F (14.3°C) and 47.1°F (8.4°C). In San Mateo, the average high-temperature is practically the same as in January - a still mild 57.7°F (14.3°C). Weather in February »

March, the first month of the spring, in San Mateo, is also a moderate month, with temperature in the range of an average high of 59.2°F (15.1°C) and an average low of 47.7°F (8.7°C). In San Mateo, California, the average high-temperature in March is almost the same as in February - a still moderate 59.2°F (15.1°C). Weather in March »

April in San Mateo, California, is an enjoyable spring month, with average temperature varying between 48.7°F (9.3°C) and 62.2°F (16.8°C). In San Mateo, the average high-temperature in April is practically the same as in March - a comfortable 62.2°F (16.8°C). Weather in April »

May, the last month of the spring, in San Mateo, is another comfortable month, with average temperature varying between 50.7°F (10.4°C) and 63.9°F (17.7°C). In May, the average high-temperature is essentially the same as in April - a still comfortable 63.9°F (17.7°C). Weather in May »

June, the first month of the summer, in San Mateo, is a pleasant month, with average temperature fluctuating between 68.5°F (20.3°C) and 53.4°F (11.9°C). In San Mateo, California, the average high-temperature is relatively the same as in May - an agreeable 68.5°F (20.3°C). Weather in June »

July, like June, is an agreeable summer month in San Mateo, California, with average temperature varying between 70.9°F (21.6°C) and 54.7°F (12.6°C). In San Mateo, the average high-temperature is essentially the same as in June - a still pleasant 70.9°F (21.6°C). Weather in July »

August, the last month of the summer, in San Mateo, is also an agreeable month, with average temperature varying between 71.2°F (21.8°C) and 56.3°F (13.5°C). The warmest months are August and September, with an average high-temperature of 71.2°F (21.8°C). Weather in August »

The first month of the autumn, September, is still a pleasant month in San Mateo, California, with temperature in the range of an average low of 56.7°F (13.7°C) and an average high of 71.2°F (21.8°C). The warmest months are August and September, with an average high-temperature of 71.2°F (21.8°C). Weather in September »

October, like September, in San Mateo, California, is another enjoyable autumn month, with average temperature fluctuating between 67.8°F (19.9°C) and 55.2°F (12.9°C). In San Mateo, the average high-temperature is almost the same as in September - an enjoyable 67.8°F (19.9°C). Weather in October »

The last month of the autumn, November, is another comfortable month in San Mateo, California, with average temperature ranging between min 50.9°F (10.5°C) and max 61.3°F (16.3°C). In San Mateo, the average high-temperature marginally drops, from an enjoyable 67.8°F (19.9°C) in October, to a still comfortable 61.3°F (16.3°C). Weather in November »

December, the first month of the winter, in San Mateo, is still a mild month, with average temperature fluctuating between 55.8°F (13.2°C) and 47.5°F (8.6°C). With an average high-temperature of 55.8°F (13.2°C) and an average low-temperature of 47.5°F (8.6°C), December is the coldest month. Weather in December »

How many days does it rain in San Mateo?

Throughout the year, there are 32.6 rainfall days, and 2.13" (54mm) of precipitation is accumulated.

What is the wettest month in San Mateo?

The month with the most rainfall in San Mateo, California, is February when the rain falls for 3.2 days and typically aggregates up to 0.55" (14mm) of precipitation.

What are the months with the lowest UV index in San Mateo?

Months with the lowest UV index in San Mateo are February and December, with an average maximum UV index of 3.

What is the most humid month in San Mateo?

Months with the highest humidity are March and August, with an average relative humidity of 76%.

What is the driest month in San Mateo?

June through August are months without rainfall.

When are the longest days in San Mateo?

With an average of 14.7h of daylight, June has the longest days of the year in San Mateo, California.

What is the month with the highest UV index in San Mateo?

June through September, with an average maximum UV index of 5, are months with the highest UV index.

What month has the most sunshine in San Mateo?

July has the most sunshine of the year, with an average of 12h of sunshine.

What is the warmest month in San Mateo?

Warmest months in San Mateo are August and September, with an average high-temperature of 71.2°F (21.8°C).

When does it rain in San Mateo?

Months with rainfall in San Mateo are January through May, September through December.

What is the least humid month in San Mateo?

Months with the lowest humidity in San Mateo, California, are October and November, with an average relative humidity of 70%.

What is the coldest month in San Mateo?

December is the coldest month in San Mateo, with an average high-temperature of 55.8°F (13.2°C) and an average low-temperature of 47.5°F (8.6°C).

What is the month with the shortest days in San Mateo?

December has the shortest days of the year in San Mateo, with an average of 9.6h of daylight.

What is the month with the least sunshine in San Mateo?

With an average of 5.9h of sunshine, December has the least sunshine of the year.
Average temperature - San Mateo, CA

Warmest months (with the highest average high temperature) are August and September (71.2°F).
The month with the lowest average high temperature is December (55.8°F).

The month with the highest average low temperature is September (56.7°F).
The coldest month (with the lowest average low temperature) is January (46.9°F).

Average humidity - San Mateo, CA
Average rainfall - San Mateo, CA

The wettest month (with the highest rainfall) is February (0.55").
Driest months (with the lowest rainfall) are June, July and August (0").

Average rainfall days - San Mateo, CA

The month with the highest number of rainy days is March (6.8 days).
The month with the lowest number of rainy days is July (0.3 days).

Average daylight / Average sunshine - San Mateo, CA
Average UV index - San Mateo, CA