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
With the transition into April, Castro Valley notes an average high-temperature of a still enjoyable 66.2°F (19°C), closely resembling March. Castro Valley's average low-temperature is measured at a frosty 46.4°F (8°C) during April.Humidity
In Castro Valley, the average relative humidity in April is 70%.Rainfall
In Castro Valley, California, during April, the rain falls for 7 days and regularly aggregates up to 0.63" (16mm) of precipitation. Throughout the year, there are 69.2 rainfall days, and 11.1" (282mm) of precipitation is accumulated.Daylight
In April, the average length of the day in Castro Valley is 13h and 12min.On the first day of the month, sunrise is at 6:52 am and sunset at 7:31 pm. On the last day of April, in Castro Valley, California, sunrise is at 6:12 am and sunset at 7:58 pm PDT.
Sunshine
In Castro Valley, the average sunshine in April is 10.5h.UV index
In Castro Valley, California, the average daily maximum UV index in April is 5. A UV Index estimate of 3 to 5 represents a moderate health risk from unsafe exposure to UV radiation for ordinary individuals.Note: In April, a daily maximum UV index of 5 leads to the following instructions:
Put precautions into practice - Guidance to elude sunburn is provided. Exposing oneself to the midday Sun can be harmful due to the strong UV radiation; limit your time outside. For optimum UV protection, wear sun-resistant attire complemented with a hat and quality shades.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Castro Valley in April?
What is the average humidity in April in Castro Valley?
How much does it rain in Castro Valley in April?
What is the average length of the day in April in Castro Valley?
When is the sunrise / sunset in April in Castro Valley?
How many hours of sunshine does Castro Valley have in April?
What is the UV index reading in April in Castro Valley?
Average temperature in April
Castro Valley, CA
- Average high temperature in April: 66.2°F
The warmest month (with the highest average high temperature) is July (80.2°F).
The month with the lowest average high temperature is December (55.9°F).
- Average low temperature in April: 46.4°F
The month with the highest average low temperature is August (56.5°F).
The coldest months (with the lowest average low temperature) are January and December (43.7°F).
Average pressure in April
Castro Valley, CA
- Average pressure in April: 30.03"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The months with the lowest atmospheric pressure are June, August and September (29.92"Hg).
Average wind speed in April
Castro Valley, CA
- Average wind speed in April: 6.3mph
The windiest month (with the highest average wind speed) is May (6.6mph).
The calmest month (with the lowest average wind speed) is November (4.6mph).
Average humidity in April
Castro Valley, CA
- Average humidity in April: 70%
The month with the highest relative humidity is March (74%).
The month with the lowest relative humidity is September (61%).
Average rainfall in April
Castro Valley, CA
- Average rainfall in April: 0.63"
The wettest month (with the highest rainfall) is February (2.28").
The driest months (with the least rainfall) are July and August (0.04").
Average rainfall days in April
Castro Valley, CA
- Average rainfall days in April: 7 days
The month with the highest number of rainy days is March (12.4 days).
The month with the least rainy days is August (0.9 days).
Average daylight in April /
Average sunshine in April
Castro Valley, 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 3min
The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 5h and 54min).
Average sunshine days in April
Castro Valley, CA
- Average sunshine days in April: 22.1 days
The month with the most sunshine days is August (28.9 days).
The month with the least sunshine days is March (17.3 days).
Average UV index in April
Castro Valley, CA
- Average UV index in April: 5
The month with the highest UV index is June (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 3).
Average cloud cover in April
Castro Valley, CA
- Average cloud cover in April: 26
The months with the most cloud cover are March and December (Cloud cover 34).
The month with the least cloud cover is July (Cloud cover 7).
Average visibility in April
Castro Valley, 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).
Castro Valley, California, USA
Weather forecast for your location
2. Allow the app to use your location