Climate and monthly weather forecast
San Bruno, CA

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Weather in January

January, the same as December, in San Bruno, California, is another mild winter month, with an average temperature fluctuating between 47.8°F (8.8°C) and 56.3°F (13.5°C). Upon the onset of January, San Bruno witnesses an average high-temperature of a still mild 56.3°F (13.5°C), showing a close resemblance to the prior month. Weather in January »

Weather in February

February, the last month of the winter in San Bruno, is another mild month, with an average temperature ranging between max 57.2°F (14°C) and min 47.8°F (8.8°C). San Bruno ushers in February with an average high-temperature of a still moderate 57.2°F (14°C), showing a close resemblance to the previous month. Weather in February »

Weather in March

March, the first month of the spring in San Bruno, is also a moderate month, with an average temperature ranging between max 58.5°F (14.7°C) and min 48°F (8.9°C). The commencement of March notes an average high-temperature of a still mild 58.5°F (14.7°C), exhibiting little difference from the previous month. Weather in March »

Weather in April

April is a refreshing spring month in San Bruno, California, with temperature in the range of an average low of 49.3°F (9.6°C) and an average high of 60.8°F (16°C). The commencement of April brings an average high-temperature of a still refreshing 60.8°F (16°C), marking an inconsequential divergence from March. Weather in April »

Weather in May

The last month of the spring, May, is also an enjoyable month in San Bruno, California, with temperature in the range of an average high of 62.8°F (17.1°C) and an average low of 51.3°F (10.7°C). On the advent of May, San Bruno's average high-temperature exhibits a minor adjustment to a still refreshing 62.8°F (17.1°C) from April's 60.8°F (16°C). Weather in May »

Weather in June

June, the first month of the summer in San Bruno, is also an enjoyable month, with an average temperature varying between 53.8°F (12.1°C) and 67.3°F (19.6°C). San Bruno's average high-temperature in June sits at a still refreshing 67.3°F (19.6°C), showing little difference from the previous month. Weather in June »

Weather in July

July in San Bruno, California, is a pleasant summer month, with an average temperature fluctuating between 54.7°F (12.6°C) and 68.5°F (20.3°C). The commencement of July records an average high-temperature of a pleasant 68.5°F (20.3°C), barely varying from June's 67.3°F (19.6°C). Weather in July »

Weather in August

The last month of the summer, August, is another pleasant month in San Bruno, California, with an average temperature fluctuating between 56.3°F (13.5°C) and 69.1°F (20.6°C). July's transformation into August witnesses an average high-temperature of a still agreeable 69.1°F (20.6°C), noting a minor change from the preceding month. Weather in August »

Weather in September

The first month of the autumn, September, is still a pleasant month in San Bruno, California, with temperature in the range of an average high of 69.8°F (21°C) and an average low of 56.5°F (13.6°C). In San Bruno, September is the warmest month, with temperatures averaging a high of 69.8°F (21°C) and a low of 56.5°F (13.6°C). Weather in September »

Weather in October

October, the same as September, is another refreshing autumn month in San Bruno, California, with an average temperature varying between 55.6°F (13.1°C) and 66.7°F (19.3°C). The onset of October manifests an average high-temperature of a comfortable 66.7°F (19.3°C), demonstrating a minor variation from the preceding month. Weather in October »

Weather in November

The last month of the autumn, November, is another comfortable month in San Bruno, California, with an average temperature ranging between min 51.8°F (11°C) and max 61°F (16.1°C). November's arrival comes with a mild decrease in the average high-temperature, moving subtly 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 still a refreshing month in San Bruno, California, with an average temperature fluctuating between 47.7°F (8.7°C) and 55.8°F (13.2°C). December is San Bruno's coldest month, registering average high temperatures of 55.8°F (13.2°C) and lows of 47.7°F (8.7°C). Weather in December »
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Frequently asked questions

How many days does it rain in San Bruno?

In San Bruno, California, during the entire year, the rain falls for 81.8 days and collects up to 13.46" (342mm) of precipitation.

What is the wettest month in San Bruno?

February is the month with the most rainfall in San Bruno, California. Rain falls for 9 days and accumulates 2.72" (69mm) of precipitation.

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

February, November and December, with an average maximum UV index of 3, are months with the lowest UV index in San Bruno, California.

When is Daylight Saving Time (DST) in San Bruno?

On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in San Bruno, California, and the time zone changes from PST to PDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from PDT to PST.

When are the longest days in San Bruno?

The month with the longest days is June, with an average of 14h and 42min of daylight.

What are the months with 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?

The 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.

What part of the year is the hottest in San Bruno?

San Bruno witnesses the warmest weather in September, with temperatures averaging a high of 69.8°F (21°C) and a low of 56.5°F (13.6°C).

What are the least humid months in San Bruno?

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

What time of the year is the coldest in San Bruno?

San Bruno experiences its average lowest temperatures in December, reaching a peak of 55.8°F (13.2°C) and a minimum of 47.7°F (8.7°C).

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

The month with the shortest days in San Bruno, California, is December, with an average of 9h and 36min of daylight.

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

The month with the least sunshine is December, 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"Hg).
The month with the lowest atmospheric pressure is September (29.92"Hg).

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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%).
The 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).
The 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: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 36min).

The month with the most sunshine is July (Average sunshine: 11h and 48min).
The month with the least sunshine is December (Average sunshine: 5h and 48min).

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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

The months with the highest UV index are June, July, August and September (UV index 5).
The 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

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

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San Bruno, California, USA

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