October weather forecast
San Bruno, CA

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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).

Temperature

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. San Bruno experiences an average nighttime temperature of 55.6°F (13.1°C) in the month of October.

Humidity

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

Rainfall

In San Bruno, in October, it is raining for 5.5 days, with typically 0.71" (18mm) of accumulated precipitation. Throughout the year, in San Bruno, there are 81.8 rainfall days, and 13.46" (342mm) of precipitation is accumulated.

Daylight

In San Bruno, the average length of the day in October is 11h and 13min.
On the first day of October, sunrise is at 7:05 am and sunset at 6:52 pm. On the last day of the month, sunrise is at 7:34 am and sunset at 6:11 pm PDT.

Sunshine

In San Bruno, the average sunshine in October is 7h.

UV index

The average daily maximum UV index in October is 4. 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 October, the maximum UV index of 4 translates into these guidelines:
Ensure safety - Imperative it is to shield skin and eyes from damage. Limiting sun exposure during midday hours helps in reducing the harmful effects of UV radiation. Employ a hat with a wide brim for robust protection, cutting UV exposure by half.
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Frequently asked questions

What is the temperature in October in San Bruno?

The average high-temperature, in October, in San Bruno, is 66.7°F (19.3°C), while the average low-temperature is 55.6°F (13.1°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 is the average humidity in October in San Bruno?

In San Bruno, California, the average relative humidity in October is 71%.

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

In San Bruno, in October, it is raining for 5.5 days, with typically 0.71" (18mm) of accumulated precipitation.

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

In San Bruno, California, the average day length in October is 11h and 13min.

When are sunrise and sunset in October in San Bruno?

On the first day of October, sunrise is at 7:05 am and sunset at 6:52 pm. On the last day of the month, sunrise is at 7:34 am and sunset at 6:11 pm PDT.

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

In San Bruno, the average sunshine duration in October is 7h.

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

In October, the average daily maximum UV index in San Bruno, California, is 4. A UV Index of 3 to 5 symbolizes a medium hazard to health 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 October
San Bruno, CA

Average temperature in October - San Bruno, CA
  • Average high temperature in October: 66.7°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 October: 55.6°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 October
San Bruno, CA

Average pressure in October - San Bruno, CA
  • Average pressure in October: 29.98"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 October
San Bruno, CA

Average wind speed in October - San Bruno, CA
  • Average wind speed in October: 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 October
San Bruno, CA

Average humidity in October - San Bruno, CA
  • Average humidity in October: 71%

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 October
San Bruno, CA

Average rainfall in October - San Bruno, CA
  • Average rainfall in October: 0.71"

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 October
San Bruno, CA

Average rainfall days in October - San Bruno, CA
  • Average rainfall days in October: 5.5 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 October /
Average sunshine in October
San Bruno, CA

Average daylight in October / Average sunshine in October - San Bruno, CA
  • Average daylight in October: 11h and 1min

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 October: 7h and 0min

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 October
San Bruno, CA

Average sunshine days in October - San Bruno, CA
  • Average sunshine days in October: 23.5 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 October
San Bruno, CA

Average UV index in October - San Bruno, CA
  • Average UV index in October: 4

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 October
San Bruno, CA

Average cloud cover in October - San Bruno, CA
  • Average cloud cover in October: 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 October
San Bruno, CA

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