World sea water temperatures

Water temperature in Hercules (CA) in May

Is it warm enough to swim in Hercules in May? Average water temperature in Hercules in May is 57°F and therefore is not suitable for comfortable swimming. The warmest sea in Hercules in May is 69.1°F, and the coldest is 50.2°F. To find out the sea temperature today and in the coming days, go to Current sea temperature in Hercules

Changes water temperature in Hercules in May 2025, 2024

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

You can choose any other years:

Year 1:   Year 2:


Day 2025 2024 Min Max
May 158.5°F62.2°F51.1°F63°F
May 260.4°F62.2°F50.9°F62.8°F
May 361.3°F62.1°F50.9°F63°F
May 460.1°F61.2°F50.9°F62.6°F
May 560.4°F60.3°F50.7°F62.4°F
May 661°F59.7°F50.9°F63.3°F
May 759°F60.4°F50.7°F63.7°F
May 859.2°F59.9°F50.2°F63.7°F
May 960.8°F60.3°F50.2°F63.3°F
May 1062.2°F60.4°F50.4°F63.3°F
May 1162.1°F61.2°F50.4°F63.9°F
May 1262.2°F62.4°F50.5°F63.7°F
May 1361.9°F61.3°F50.9°F63.3°F
May 1463°F60.8°F50.5°F63°F
May 1562.2°F60.1°F50.5°F62.4°F
Day 2025 2024 Min Max
May 1662.4°F60.6°F50.5°F63°F
May 1762.6°F59.7°F50.5°F63.1°F
May 1862.6°F60.1°F50.9°F63°F
May 1964°F59.9°F51.3°F64°F
May 2064.4°F60.1°F51.1°F64.4°F
May 2164.2°F60.8°F50.7°F64.2°F
May 2263.3°F61.7°F50.4°F64°F
May 2363.9°F62.2°F50.4°F65.1°F
May 2461.9°F61.9°F50.5°F64.8°F
May 2561.3°F62.1°F50.5°F65.1°F
May 2662.2°F61.7°F50.5°F67.1°F
May 2762.4°F62.1°F50.4°F69.1°F
May 2862.2°F61.3°F50.7°F68.2°F
May 2962.1°F63°F50.9°F67.1°F
May 3062.8°F64°F51.3°F65.8°F
May 3163.1°F64.8°F51.4°F65.1°F
Hercules water temp chart in May

Average water temperature in Hercules in May over a decade

20162017201820192020
59°F55.8°F61.3°F61.2°F63.7°F
20212022202320242025
61.9°F62.1°F60.8°F61.3°F61.9°F

Hercules sea state in May

Chart comparing the height of waves in Hercules in May 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 Hercules in May

Hercules 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 May?

Want to know where the water temperature in May 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 May

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

AvrMinMax
San Diego63°F57.4°F68°F
Santa Monica61.3°F55.9°F68.4°F
La Jolla Cove64°F58.1°F69.6°F
Lake Tahoe50.7°F43.9°F59°F
Los Angeles60.8°F56.5°F65.1°F
Pinole57°F50.2°F69.1°F
Rodeo57°F50.2°F69.1°F
Montalvin57°F50.2°F68.5°F
San Pablo Bay57°F50.2°F68.5°F
China Camp57°F50.2°F67.6°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 Hercules 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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