Contents
- Weather in April
- Frequently asked questions
- Average temperature in April
- Average pressure in April
- Average wind speed in April
- Average humidity in April
- Average rainfall in April
- Average rainfall days in April
- Average daylight in April
- Average sunshine in April
- Average sunshine days in April
- Average UV index in April
- Average cloud cover in April
- Average visibility in April
Weather in April
Temperature
The arrival of April sees an average high-temperature of a still refreshing 62.2°F (16.8°C), hardly diverging from March's 59.2°F (15.1°C). Nightly temperatures in Foster City drop to an average low of 48.7°F (9.3°C) in April.Humidity
In Foster City, the average relative humidity in April is 74%.Rainfall
In Foster City, California, during April, the rain falls for 3.8 days and regularly aggregates up to 0.08" (2mm) of precipitation. Throughout the year, in Foster City, there are 32.6 rainfall days, and 2.13" (54mm) of precipitation is accumulated.Daylight
In April, the average length of the day is 13h and 12min.On the first day of the month, sunrise is at 6:53 am and sunset at 7:32 pm. On the last day of April, sunrise is at 6:13 am and sunset at 7:58 pm PDT.
Sunshine
In Foster City, the average sunshine in April is 10.3h.UV index
In Foster City, the average daily maximum UV index in April is 4. A UV Index reading of 3 to 5 represents a medium vulnerability from unsafe exposure to UV radiation for the ordinary person.Note: The maximum daily UV index of 4 in April interprets into the following recommendations:
Undertake protective steps - Preventing sun damage is advised. The Sun's harshest UV rays are around midday; it's wise to seek shade and limit time outdoors. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in April?
What is the average humidity in April?
How much does it rain in April?
What is the average length of the day in April?
When is the sunrise / sunset in April?
How long on average sun shines in April in Foster City?
What is the UV index reading in April?
Average temperature in April
Foster City, CA
- Average high temperature in April: 62.2°F
The warmest months (with the highest average high temperature) are August and September (71.2°F).
The month with the lowest average high temperature is December (55.8°F).
- Average low temperature in April: 48.7°F
The month with the highest average low temperature is September (56.7°F).
The coldest month (with the lowest average low temperature) is January (46.9°F).
Average pressure in April
Foster City, 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
Foster City, CA
- Average wind speed in April: 8mph
The windiest month (with the highest average wind speed) is April (8mph).
The calmest months (with the lowest average wind speed) are August, September and October (5.9mph).
Average humidity in April
Foster City, CA
- Average humidity in April: 74%
The months with the highest relative humidity are March and August (76%).
The months with the lowest relative humidity are October and November (70%).
Average rainfall in April
Foster City, CA
- Average rainfall in April: 0.08"
The wettest month (with the highest rainfall) is February (0.55").
The driest months (with the least rainfall) are June, July and August (0").
Average rainfall days in April
Foster City, CA
- Average rainfall days in April: 3.8 days
The month with the highest number of rainy days is March (6.8 days).
The month with the least rainy days is July (0.3 days).
Average daylight in April /
Average sunshine in April
Foster City, 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 2min
The month with the most sunshine is July (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 5h and 54min).
Average sunshine days in April
Foster City, CA
- Average sunshine days in April: 25.4 days
The month with the most sunshine days is July (30.4 days).
The month with the least sunshine days is February (23.3 days).
Average UV index in April
Foster City, 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 and December (UV index 3).
Average cloud cover in April
Foster City, CA
- Average cloud cover in April: 27
The month with the most cloud cover is March (Cloud cover 35).
The month with the least cloud cover is July (Cloud cover 11).
Average visibility in April
Foster City, 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).
Foster City, California, USA
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