April weather forecast
San Bruno, CA

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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).

Temperature

The commencement of April brings an average high-temperature of a still refreshing 60.8°F (16°C), marking an inconsequential divergence from March. During April, San Bruno experiences an average low-temperature of 49.3°F (9.6°C) at night.

Humidity

In San Bruno, California, the average relative humidity in April is 75%.

Rainfall

In San Bruno, during April, the rain falls for 8.7 days and regularly aggregates up to 0.75" (19mm) of precipitation. In San Bruno, during the entire year, the rain falls for 81.8 days and collects up to 13.46" (342mm) of precipitation.

Daylight

The average length of the day in April in San Bruno, California, is 13h and 12min.
On the first day of April, sunrise is at 6:53 am and sunset at 7:32 pm. On the last day of the month, sunrise is at 6:14 am and sunset at 7:59 pm PDT.

Sunshine

In San Bruno, the average sunshine in April is 10.2h.

UV index

In San Bruno, the average daily maximum UV index in April is 4. A UV Index value of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV rays for the ordinary person.
Note: In April, an average UV index of 4 transforms into the following instructions:
Exercise prevention - Protecting skin and eyes from harm is required. Being exposed to the midday Sun can have harmful effects due to strong UV radiation; always take precautions. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure.
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Frequently asked questions

What are April temperatures in San Bruno?

San Bruno in April has an average high-temperature of 60.8°F (16°C) and an average low-temperature of 49.3°F (9.6°C).

What is the average humidity in April in San Bruno?

In April, the average relative humidity is 75%.

How much does it rain in San Bruno in April?

In San Bruno, California, in April, it is raining for 8.7 days, with typically 0.75" (19mm) of accumulated precipitation.

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

In San Bruno, California, the average day length in April is 13h and 12min.

When are sunrise and sunset in April in San Bruno?

On the first day of April in San Bruno, California, sunrise is at 6:53 am and sunset at 7:32 pm. On the last day of the month, sunrise is at 6:14 am and sunset at 7:59 pm PDT.

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

In April, the average sunshine duration in San Bruno is 10.2h.

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

The average daily maximum UV index in April in San Bruno is 4. A UV Index value of 3 to 5 symbolizes a medium health risk 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 April
San Bruno, CA

Average temperature in April - San Bruno, CA
  • Average high temperature in April: 60.8°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 April: 49.3°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 April
San Bruno, CA

Average pressure in April - San Bruno, CA
  • Average pressure in April: 30.04"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 April
San Bruno, CA

Average wind speed in April - San Bruno, CA
  • Average wind speed in April: 8.5mph

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 April
San Bruno, CA

Average humidity in April - San Bruno, CA
  • Average humidity in April: 75%

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 April
San Bruno, CA

Average rainfall in April - San Bruno, CA
  • Average rainfall in April: 0.75"

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 April
San Bruno, CA

Average rainfall days in April - San Bruno, CA
  • Average rainfall days in April: 8.7 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 April /
Average sunshine in April
San Bruno, CA

Average daylight in April / Average sunshine in April - San Bruno, CA
  • Average daylight in April: 13h 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 April: 10h and 1min

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 April
San Bruno, CA

Average sunshine days in April - San Bruno, CA
  • Average sunshine days in April: 19.8 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 April
San Bruno, CA

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

Average cloud cover in April - San Bruno, CA
  • Average cloud cover in April: 28

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 April
San Bruno, CA

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