April weather forecast and climate
San Bruno, CA

Weather in April

April in San Bruno, California, is a comfortable spring month, with average temperature fluctuating between 60.8°F (16°C) and 49.3°F (9.6°C).

Temperature

In April, the average high-temperature is essentially the same as in March - an enjoyable 60.8°F (16°C). The average low-temperature, in San Bruno, is 49.3°F (9.6°C).

Humidity

The average relative humidity in April is 75%.

Rainfall

In San Bruno, in April, it is raining for 8.7 days, with typically 0.75" (19mm) of accumulated precipitation. Throughout the year, there are 81.8 rainfall days, and 13.46" (342mm) of precipitation is accumulated.

Daylight

In San Bruno, the average length of the day is 13.2h.

Sunshine

The average sunshine in San Bruno is 10.2h.

UV index

In San Bruno, the average daily maximum UV index in April is 4. A UV Index estimate of 3 to 5 represents a moderate health risk from the exposure to the Sun's UV rays for average individuals.
Note: The daily maximum UV index of 4 interpret into the following advice:
Take precautions - Protection against sunburn is recommended. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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FAQ

What is the temperature in April in San Bruno?

The average high-temperature, in April, in San Bruno, California, is 60.8°F (16°C), while the average low-temperature is 49.3°F (9.6°C).

What is the average humidity in April in San Bruno?

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

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

In San Bruno, California, during April, the rain falls for 8.7 days and regularly aggregates up to 0.75" (19mm) of precipitation.

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

In San Bruno, California, the average length of the day in April is 13.2h.

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

In April, the average sunshine is 10.2h.

How high is the UV index in April in San Bruno?

The average daily maximum UV index in April in San Bruno is 4. A UV Index estimate of 3 to 5 represents a medium health risk from unsafe exposure to the Sun's UV rays.

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"

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 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%).
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).
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: 13.2h

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 April: 10.2h

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 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

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 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

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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