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Water temperature in Castro Valley (CA) in July

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Is it warm enough to swim in Castro Valley in July? Average water temperature in Castro Valley in July is 62.1°F and therefore is not suitable for comfortable swimming. The warmest sea in Castro Valley in July is 75.2°F, and the coldest is 52.9°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 July 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 July.

You can choose any other years:

Year 1:   Year 2:


Day 2025 2024 Min Max
July 168.4°F69.1°F53.6°F71.1°F
July 270°F70.2°F53.4°F71.1°F
July 369.3°F71.4°F52.9°F71.4°F
July 468.9°F72.9°F53.4°F72.9°F
July 567.6°F73.9°F53.6°F73.9°F
July 667.8°F73.6°F53.8°F73.6°F
July 768°F74.1°F54°F74.1°F
July 868.5°F72.7°F54°F72.7°F
July 968.9°F73.6°F54°F73.6°F
July 1068.2°F72.3°F54.3°F72.3°F
July 1169.3°F73.8°F54.7°F73.8°F
July 1270°F73.4°F54.5°F73.4°F
July 1369.8°F75.2°F54.5°F75.2°F
July 1471.1°F73.8°F54.7°F73.8°F
July 1572.3°F72.5°F54.9°F72.5°F
Day 2025 2024 Min Max
July 1671.6°F72.5°F55.2°F72.5°F
July 1770.9°F72°F55.8°F72.1°F
July 1870.9°F71.6°F56.3°F71.6°F
July 1970.7°F72.1°F55.8°F72.5°F
July 2069.3°F72.1°F55.4°F72.5°F
July 2168.5°F71.2°F55.6°F71.8°F
July 2267.1°F71.8°F55°F72°F
July 2365.5°F73°F55.2°F73°F
July 2465.5°F74.5°F55.4°F74.5°F
July 2565.1°F74.1°F55.4°F74.1°F
July 2666°F74.5°F54.9°F74.5°F
July 2766.7°F72.7°F55°F73.4°F
July 2865.3°F71.4°F54.5°F72.9°F
July 2965.7°F69.6°F54°F73.4°F
July 3064.9°F68.2°F54°F72.3°F
July 3164.8°F66.4°F54.5°F71.6°F
Castro Valley water temp chart in July

Average water temperature in Castro Valley in July over a decade

20162017201820192020
56.5°F57.9°F64.6°F69.4°F71.4°F
20212022202320242025
70°F68.9°F69.3°F72.3°F68.2°F

Castro Valley sea state in July

Chart comparing the height of waves in Castro Valley in July 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 July

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 July?

Want to know where the water temperature in July 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 July

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

AvrMinMax
San Diego68.5°F62.8°F74.8°F
Santa Monica67.6°F61.5°F72.5°F
La Jolla Cove70°F63.5°F76.5°F
Lake Tahoe66.2°F58.8°F73°F
Los Angeles66.6°F60.6°F71.8°F
Millbrae61.9°F53.1°F74.8°F
Foster City61.9°F52.9°F74.5°F
San Leandro62.1°F53.1°F75.4°F
San Jose61.9°F52.7°F74.5°F
Coyote Point61.7°F52.9°F73.9°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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