April weather forecastSan Bruno, CA
April
Weather in April
April is a refreshing spring month in San Bruno, California, with an average temperature varying between 60.8°F (16°C) and 49.3°F (9.6°C).Temperature
April begins with an average high-temperature of a comfortable 60.8°F (16°C), reflecting close similarity to the preceding month. April witnesses an average low-temperature hovering around a frosty 49.3°F (9.6°C).Humidity
In April, the average relative humidity in San Bruno 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. 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 in April 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 April, the average sunshine is 10.2h.UV index
In San Bruno, the average daily maximum UV index in April is 4. A UV Index reading of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV radiation for the ordinary person.Note: The daily maximum UV index of 4 in April interprets into the following advice:
Be cautious. Those with fair skin can be subjected to burns in fewer than 30 minutes. Considering the Sun's intensity during midday, it's wise to minimize direct exposure. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
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).
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).
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).
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%).
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").
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).
Average daylight in April /
Average sunshine in April
San Bruno, CA
- Average daylight in April: 13h and 12min
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 12min
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).
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).
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).
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).
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).
