August weather forecast and climate
San Bruno, CA

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).

Temperature

In August, the average high-temperature is practically the same as in July - a still pleasant 69.1°F (20.6°C). In San Bruno, in August, the average low-temperature is 56.3°F (13.5°C).

Humidity

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

Rainfall

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

Daylight

The average length of the day in San Bruno is 13.6h.

Sunshine

In August, the average sunshine is 11.5h.

UV index

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 unprotected exposure to the Sun's UV rays for ordinary individuals.
Note: The average daily UV index of 5 in August transform into the following instructions:
Take precautions - Protection against sunburn is recommended. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.
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FAQ

What is the temperature in August in San Bruno?

In August, in San Bruno, California, the average high-temperature is 69.1°F (20.6°C), and the average 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, California.

What is the average humidity in August in San Bruno?

In San Bruno, California, the average relative humidity in August is 79%.

How many days does it rain in August in San Bruno?

In August, the rain falls for 2.2 days. Throughout August, 0.04" (1mm) of precipitation is accumulated.

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

In San Bruno, the average length of the day in August is 13.6h.

How long on average sun shines in August in San Bruno?

In August, the average sunshine is 11.5h.

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 in San Bruno.

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

In San Bruno, California, the average daily maximum UV index in August is 5. A UV Index value of 3 to 5 symbolizes a moderate health threat from the exposure to the Sun's UV radiation.

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"

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 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%).
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).
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: 13.6h

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

  • Average sunshine in August: 11.5h

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 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

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 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

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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