July weather forecast
San Bruno, CA

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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).

Temperature

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). During July, the average low-temperature is a cool 54.7°F (12.6°C).

Humidity

In July, the average relative humidity is 77%.

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 July, the average length of the day in San Bruno is 14h and 28min.
On the first day of July, sunrise is at 5:52 am and sunset at 8:35 pm. On the last day of the month, sunrise is at 6:13 am and sunset at 8:18 pm PDT.

Sunshine

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

UV index

The months with the highest UV index are June through September, with an average maximum UV index of 5. A UV Index reading of 3 to 5 represents a moderate health risk from exposure to the Sun's UV rays for the average person.
Note: The UV index of 5 during July leads to these advisories:
Take necessary precautions - Defending against sun damage is advocated. Direct exposure to the Sun during its peak hours around mid-day should be minimized for safety. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes.
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Frequently asked questions

What is the usual temperature for San Bruno in July?

During July, San Bruno experiences an average high-temperature of 68.5°F (20.3°C) and a low-temperature of 54.7°F (12.6°C).

What is the average humidity in July in San Bruno?

In July, the average relative humidity in San Bruno is 77%.

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 July?

In San Bruno, in July, it is raining for 2.2 days, with typically 0.04" (1mm) of accumulated precipitation.

How many hours of daylight does San Bruno have in July?

In July, the average day length is 14h and 28min.

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

On the first day of July in San Bruno, California, sunrise is at 5:52 am and sunset at 8:35 pm. On the last day of the month, sunrise is at 6:13 am and sunset at 8:18 pm PDT.

What month has the most sunshine in San Bruno?

The month with the most sunshine in San Bruno, California, is July, with an average of 11.8h of sunshine.

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

In San Bruno, the average sunshine duration in July is 11.8h.

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

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

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

The average daily maximum UV index in July in San Bruno is 5. A UV Index reading of 3 to 5 represents a moderate vulnerability from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in July
San Bruno, CA

Average temperature in July - San Bruno, CA
  • Average high temperature in July: 68.5°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 July: 54.7°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 July
San Bruno, CA

Average pressure in July - San Bruno, CA
  • Average pressure in July: 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 July
San Bruno, CA

Average wind speed in July - San Bruno, CA
  • Average wind speed in July: 6.5mph

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 July
San Bruno, CA

Average humidity in July - San Bruno, CA
  • Average humidity in July: 77%

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 July
San Bruno, CA

Average rainfall in July - San Bruno, CA
  • Average rainfall in July: 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 July
San Bruno, CA

Average rainfall days in July - San Bruno, CA
  • Average rainfall days in July: 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 July /
Average sunshine in July
San Bruno, CA

Average daylight in July / Average sunshine in July - San Bruno, CA
  • Average daylight in July: 14h and 3min

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 July: 11h and 5min

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 July
San Bruno, CA

Average sunshine days in July - San Bruno, CA
  • Average sunshine days in July: 27.3 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 July
San Bruno, CA

Average UV index in July - San Bruno, CA
  • Average UV index in July: 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 July
San Bruno, CA

Average cloud cover in July - San Bruno, CA
  • Average cloud cover in July: 17

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 July
San Bruno, CA

Average visibility in July - San Bruno, CA
  • Average visibility in July: 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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