August weather forecast
San Bruno, CA

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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).

Temperature

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. San Bruno, during the nights of August, experiences an average temperature drop to a refreshing 56.3°F (13.5°C).

Humidity

August is the most humid month, with an average relative humidity of 79%.

Rainfall

The months with the least rainfall are July and August Rain falls for 2.2 days and accumulates 0.04" (1mm) of rain.

Daylight

In August, the average length of the day is 13h and 34min.
On the first day of August, sunrise is at 6:14 am and sunset at 8:17 pm. On the last day of the month, sunrise is at 6:39 am and sunset at 7:39 pm PDT.

Sunshine

In San Bruno, California, the average sunshine in August is 11.5h.

UV index

The months with the highest UV index are June through September, with an average maximum UV index of 5. A UV Index value of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV rays for average individuals.
Note: In August, an average UV index of 5 transforms into the following instructions:
Undertake precautions - It is suggested to shield oneself from sunburn. When the Sun's UV radiation is most intense during midday, it's best to find shade and limit exposure. Enhance your sun protection with tightly woven, yet airy clothing.
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Frequently asked questions

What is the usual temperature for San Bruno in August?

The high-temperature in San Bruno, California, during August is 69.1°F (20.6°C) and the low-temperature is 56.3°F (13.5°C).

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.

What is the average humidity in August in San Bruno?

The average relative humidity in August in San Bruno is 79%.

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.

How much does it rain in San Bruno in August?

In San Bruno, in August, during 2.2 rainfall days, 0.04" (1mm) of precipitation is typically accumulated.

What is the average length of the day in August in San Bruno?

The average day length in August in San Bruno, California, is 13h and 34min.

When is the sunrise / sunset in August in San Bruno?

In August, on the first day of the month, sunrise is at 6:14 am and sunset at 8:17 pm. On the last day of the month, sunrise is at 6:39 am and sunset at 7:39 pm PDT.

How many hours of sunshine does San Bruno have in August?

The average sunshine duration in August in San Bruno is 11.5h.

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 in San Bruno, California.

What is the UV index intensity in August in San Bruno?

The average daily maximum UV index in August is 5. A UV Index estimate of 3 to 5 represents a moderate health threat from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in August
San Bruno, CA

Average temperature in August - San Bruno, CA
  • Average high temperature in August: 69.1°F

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).

  • Average low temperature in August: 56.3°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 in August
San Bruno, CA

Average pressure in August - San Bruno, CA
  • Average pressure in August: 29.93"Hg

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 in August
San Bruno, CA

Average wind speed in August - San Bruno, CA
  • Average wind speed in August: 6.3mph

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 in August
San Bruno, CA

Average humidity in August - San Bruno, CA
  • Average humidity in August: 79%

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 in August
San Bruno, CA

Average rainfall in August - San Bruno, CA
  • Average rainfall in August: 0.04"

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 in August
San Bruno, CA

Average rainfall days in August - San Bruno, CA
  • Average rainfall days in August: 2.2 days

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 in August /
Average sunshine in August
San Bruno, CA

Average daylight in August / Average sunshine in August - San Bruno, CA
  • Average daylight in August: 13h and 4min

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).

  • Average sunshine in August: 11h and 3min

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 in August
San Bruno, CA

Average sunshine days in August - San Bruno, CA
  • Average sunshine days in August: 25.5 days

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 in August
San Bruno, CA

Average UV index in August - San Bruno, CA
  • Average UV index in August: 5

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 cloud cover in August
San Bruno, CA

Average cloud cover in August - San Bruno, CA
  • Average cloud cover in August: 19

The month with the most cloud cover is March (Cloud cover 37).
The month with the least cloud cover is September (Cloud cover 16).

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Average visibility in August
San Bruno, CA

Average visibility in August - San Bruno, CA
  • Average visibility in August: 6mi

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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