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Water temperature in Castro Valley (CA) in April

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Is it warm enough to swim in Castro Valley in April? Average water temperature in Castro Valley in April is 56.7°F and therefore is not suitable for comfortable swimming. The warmest sea in Castro Valley in April is 66.4°F, and the coldest is 50.7°F. To find out the sea temperature today and in the coming days, go to Current sea temperature in Castro Valley

Changes water temperature in Castro Valley in April 2025, 2024

To get an accurate forecast for the water temperature in Castro Valley for any chosen month, compare two years within a 10 year range using the chart below. In addition to the sea water temperature in Castro Valley, the selected years in the table also show the values of the maximum and minimum temperatures on each of the days of April.

You can choose any other years:

Year 1:   Year 2:


Day 2025 2024 Min Max
April 157.9°F58.3°F51.4°F61.3°F
April 258.1°F60.1°F51.6°F61.9°F
April 358.5°F60.8°F51.4°F60.8°F
April 457.9°F60.1°F51.3°F60.4°F
April 558.1°F59.4°F51.3°F60.1°F
April 659.7°F57.9°F51.3°F60.4°F
April 758.8°F57.7°F51.4°F62.6°F
April 858.8°F58.3°F51.3°F63°F
April 960.8°F59.7°F51.6°F63°F
April 1062.1°F59.5°F51.4°F62.1°F
April 1162.2°F61°F51.8°F62.2°F
April 1262.1°F61.3°F52.3°F62.1°F
April 1362.1°F60.3°F52.2°F62.1°F
April 1463°F59.5°F51.4°F63°F
April 1562.6°F59°F51.4°F62.6°F
Day 2025 2024 Min Max
April 1662.6°F60.1°F50.9°F62.6°F
April 1762.4°F60.8°F51.1°F62.4°F
April 1862.2°F62.4°F51.4°F62.4°F
April 1961.9°F62.4°F51.4°F63.1°F
April 2063.5°F61.7°F51.1°F63.5°F
April 2163.7°F63.3°F50.7°F63.7°F
April 2264.2°F64.8°F51.1°F64.8°F
April 2363.7°F64.9°F51.4°F64.9°F
April 2462.8°F63.5°F51.6°F63.7°F
April 2562.1°F61.3°F51.4°F64.2°F
April 2661.5°F62.4°F51.4°F64.9°F
April 2760.4°F62.2°F51.4°F66.4°F
April 2860.6°F61.9°F51.4°F64.9°F
April 2961°F62.1°F51.1°F66°F
April 3061.7°F61.7°F50.7°F65.7°F
Castro Valley water temp chart in April

Average water temperature in Castro Valley in April over a decade

20162017201820192020
57.9°F56.7°F60.6°F61.7°F60.6°F
20212022202320242025
60.1°F59.9°F57.6°F61°F61.2°F

Castro Valley sea state in April

Chart comparing the height of waves in Castro Valley in April over the past years. The red line indicates the height of the waves when swimming in the sea is prohibited. To view the current sea conditions, click on the graph.

Waves height in Castro Valley in April

Castro Valley water temperature during other months:

You can also view information about water temperature for other months by clicking on the month button below

Where is the warm sea water in April?

Want to know where the water temperature in April is good for swimming? Select the continent of interest, the day of the month and the required water temperature

Region
Date (day and month)
Water temperature: min 60°F
 Average temperature  Maximum temperature

Best Beach Resorts in California in April

Places with the warmest average sea water temperature in California in April. In addition, the maximum and minimum water temperatures for that month, recorded over the last decade, are shown

AvrMinMax
San Diego60.4°F54.1°F66.6°F
Santa Monica58.6°F54°F63.9°F
La Jolla Cove61.2°F55.6°F68.7°F
Lake Tahoe44.6°F40.8°F52.7°F
Los Angeles58.8°F54.9°F63.7°F
Millbrae56.7°F50.7°F65.8°F
Foster City56.5°F50.7°F65.5°F
San Leandro56.8°F50.7°F66.7°F
San Jose56.5°F50.5°F65.8°F
Coyote Point56.5°F50.7°F65.1°F

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[1] - The "Blue Flag" is awarded to beaches which fulfill a number of criteria, including: the quality of the bathing water, which must be in accordance with the relevant European Union Directive environmental education and information and beach area management and safety.

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Our report for Castro Valley is compiled using satellite data together with in-situ observations to get the most reliable daily data of sea surface temperatures, surf forecasts, current temperatures and weather forecasts.

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