Monthly weather forecast and climate
San Bruno, CA

Weather in January

January, like December, is another mild winter month in San Bruno, California, with average temperature ranging between min 47.8°F (8.8°C) and max 56.3°F (13.5°C). In January, the average high-temperature is relatively the same as in December - a still mild 56.3°F (13.5°C). Weather in January »

Weather in February

February, the last month of the winter, in San Bruno, is another mild month, with average temperature ranging between max 57.2°F (14°C) and min 47.8°F (8.8°C). In San Bruno, the average high-temperature is almost the same as in January - a still moderate 57.2°F (14°C). Weather in February »

Weather in March

March, the first month of the spring, in San Bruno, is still a mild month, with average temperature fluctuating between 58.5°F (14.7°C) and 48°F (8.9°C). In March, the average high-temperature is essentially the same as in February - a still mild 58.5°F (14.7°C). Weather in March »

Weather in April

April in San Bruno, California, is a comfortable spring month, with average temperature fluctuating between 60.8°F (16°C) and 49.3°F (9.6°C). In April, the average high-temperature is essentially the same as in March - an enjoyable 60.8°F (16°C). Weather in April »

Weather in May

May, the last month of the spring, in San Bruno, is another comfortable month, with average temperature fluctuating between 62.8°F (17.1°C) and 51.3°F (10.7°C). In May, the average high-temperature is almost the same as in April - a still comfortable 62.8°F (17.1°C). Weather in May »

Weather in June

The first month of the summer, June, is still a comfortable month in San Bruno, California, with average temperature fluctuating between 67.3°F (19.6°C) and 53.8°F (12.1°C). In San Bruno, California, the average high-temperature is essentially the same as in May - a still comfortable 67.3°F (19.6°C). Weather in June »

Weather in July

July in San Bruno, California, is an agreeable summer month, with average temperature fluctuating between 54.7°F (12.6°C) and 68.5°F (20.3°C). In San Bruno, California, the average high-temperature is relatively the same as in June - a pleasant 68.5°F (20.3°C). Weather in July »

Weather in August

August, the last month of the summer, in San Bruno, is another pleasant month, with average temperature varying between 56.3°F (13.5°C) and 69.1°F (20.6°C). In August, the average high-temperature is practically the same as in July - a still pleasant 69.1°F (20.6°C). Weather in August »

Weather in September

September, the first month of the autumn, in San Bruno, is still a pleasant month, with average temperature ranging between max 69.8°F (21°C) and min 56.5°F (13.6°C). September is the warmest month, with an average high-temperature of 69.8°F (21°C) and an average low-temperature of 56.5°F (13.6°C). Weather in September »

Weather in October

October, like September, in San Bruno, California, is another comfortable autumn month, with temperature in the range of an average low of 55.6°F (13.1°C) and an average high of 66.7°F (19.3°C). In October, the average high-temperature is relatively the same as in September - an enjoyable 66.7°F (19.3°C). Weather in October »

Weather in November

The last month of the autumn, November, is another comfortable month in San Bruno, California, with average temperature fluctuating between 51.8°F (11°C) and 61°F (16.1°C). In San Bruno, the average high-temperature slightly decreases, from 66.7°F (19.3°C) in October, to a still enjoyable 61°F (16.1°C). Weather in November »

Weather in December

The first month of the winter, December, is also a moderate month in San Bruno, California, with average temperature varying between 47.7°F (8.7°C) and 55.8°F (13.2°C). December is the coldest month, with an average high-temperature of 55.8°F (13.2°C) and an average low-temperature of 47.7°F (8.7°C). Weather in December »
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FAQ

How much does it rain in San Bruno?

Throughout the year, there are 81.8 rainfall days, and 13.46" (342mm) of precipitation is accumulated.

What is the rainiest month in San Bruno?

The month with the most rainfall in San Bruno, California, is February when the rain falls for 9 days and typically aggregates up to 2.72" (69mm) of precipitation.

When is the lowest UV index in San Bruno?

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

When are the longest days in San Bruno?

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

When is the highest UV index in San Bruno?

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

What is the driest month in San Bruno?

Months with the least rainfall in San Bruno are July and August Rain falls for 2.2 days and accumulates 0.04" (1mm) of rain.

What month has the most sunshine in San Bruno?

The month with the most sunshine is July, with an average of 11.8h of sunshine.

What is the most humid month in San Bruno?

With an average relative humidity of 79%, August is the most humid month in San Bruno, California.

What is the warmest month in San Bruno?

With an average high-temperature of 69.8°F (21°C) and an average low-temperature of 56.5°F (13.6°C), September is the warmest month.

What are the least humid months in San Bruno?

October and November, with an average relative humidity of 71%, are the least humid months in San Bruno.

What is the coldest month in San Bruno?

With an average high-temperature of 55.8°F (13.2°C) and an average low-temperature of 47.7°F (8.7°C), December is the coldest month in San Bruno.

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

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

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

December has the least sunshine of the year, with an average of 5.8h of sunshine.

Average temperature
San Bruno, CA

Average temperature - San Bruno, CA

The warmest month (with the highest average high temperature) is September (69.8°F).
The month with the lowest average high temperature is December (55.8°F).

The month with the highest average low temperature is September (56.5°F).
The coldest month (with the lowest average low temperature) is December (47.7°F).

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Average pressure
San Bruno, CA

Average pressure - San Bruno, CA

The month with the highest atmospheric pressure is January (30.13").
The month with the lowest atmospheric pressure is September (29.92").

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Average wind speed
San Bruno, CA

Average wind speed - San Bruno, CA

The windiest month (with the highest average wind speed) is April (8.5mph).
The calmest months (with the lowest average wind speed) are August and September (6.3mph).

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Average humidity
San Bruno, CA

Average humidity - San Bruno, CA

The month with the highest relative humidity is August (79%).
Months with the lowest relative humidity are October and November (71%).

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Average rainfall
San Bruno, CA

Average rainfall - San Bruno, CA

The wettest month (with the highest rainfall) is February (2.72").
The driest months (with the least rainfall) are July and August (0.04").

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Average rainfall days
San Bruno, CA

Average rainfall days - San Bruno, CA

The month with the highest number of rainy days is March (13.3 days).
Months with the least rainy days are July and August (2.2 days).

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Average daylight / Average sunshine
San Bruno, CA

Average daylight / Average sunshine - San Bruno, CA

The month with the longest days is June (Average daylight: 14.7h).
The month with the shortest days is December (Average daylight: 9.6h).

The month with the most sunshine is July (Average sunshine: 11.8h).
The month with the least sunshine is December (Average sunshine: 5.8h).

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Average sunshine days
San Bruno, CA

Average sunshine days - San Bruno, CA

The month with the most sunshine days is July (27.3 days).
The month with the least sunshine days is March (16.3 days).

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Average UV index
San Bruno, CA

Average UV index - San Bruno, CA

Months with the highest UV index are June, July, August and September (UV index 5).
Months with the lowest UV index are February, November and December (UV index 3).

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Average visibility
San Bruno, CA

Average visibility - San Bruno, CA

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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