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Water temperature in San Francisco (CA) in April

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Is it warm enough to swim in San Francisco in April? Average water temperature in San Francisco in April is 52.3°F and therefore is not suitable for comfortable swimming. The warmest sea in San Francisco in April is 57°F, and the coldest is 47.7°F. Average high air temperature in San Francisco in April is 63°F, and average low temperature is 49°F. To find out the sea temperature today and in the coming days, go to Current sea temperature in San Francisco

Changes water temperature in San Francisco in April 2025, 2024

To get an accurate forecast for the water temperature in San Francisco for any chosen month, compare two years within a 10 year range using the chart below. In addition to the sea water temperature in San Francisco, 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 153.8°F54.1°F48.2°F55.2°F
April 253.2°F55.2°F48.6°F57°F
April 352.7°F54.7°F48.4°F56.3°F
April 452.5°F53.8°F48.2°F55.6°F
April 552.9°F53.4°F48.7°F56.7°F
April 652.9°F53.4°F49.5°F56.3°F
April 752.7°F53.4°F49.6°F56.3°F
April 853.6°F53.2°F50°F56.1°F
April 954.3°F52.7°F49.5°F56.7°F
April 1054.5°F53.2°F49.1°F55.4°F
April 1153.1°F53.2°F49.5°F54.7°F
April 1252.2°F52.9°F49.3°F54.3°F
April 1352°F52.5°F49.1°F54.9°F
April 1452.3°F53.1°F48.2°F55°F
April 1552.3°F52.5°F48.2°F55°F
Day 2025 2024 Min Max
April 1652.5°F53.2°F47.8°F55°F
April 1753.1°F53.2°F47.7°F55°F
April 1853.2°F53.2°F48.2°F55.8°F
April 1953.2°F53.8°F48.4°F56.7°F
April 2053.6°F55.8°F48.6°F56.7°F
April 2153.4°F55.4°F48.4°F56.7°F
April 2253.8°F55.2°F48.9°F56.3°F
April 2353.2°F54.9°F49.1°F55.9°F
April 2453.1°F54.7°F49.3°F55.8°F
April 2553.8°F54.5°F49.6°F55.8°F
April 2653.8°F54.9°F49.8°F55.2°F
April 2752.7°F55°F48.7°F55°F
April 2852.9°F53.8°F48.9°F55.6°F
April 2952.2°F52°F50.2°F54.7°F
April 3053.1°F51.3°F50°F55.2°F
San Francisco water temp chart in April

Average water temperature in San Francisco in April over a decade

20162017201820192020
54°F53.8°F54°F53.8°F54°F
20212022202320242025
50.5°F50.9°F50.7°F53.8°F53.1°F

San Francisco sea state in April

Chart comparing the height of waves in San Francisco 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 San Francisco in April

Weather and climate in San Francisco in April

This data display average monthly climate indicators in San Francisco in April based on our historical weather readings over a period of ten years. In addition to temperature, we include data on the number of rainy and sunny days so you can have all the information about your destination before your trip

  • Average HIGH temperature63°F
  • Average LOW temperature49°F
  • Average rainfall days7 days
  • Average rainfall41mm/1.6''
  • Average daylight13h
  • Average sunshine10.3h
  • Average UV index7

San Francisco 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
Farallon Islands52°F47.5°F56.7°F
Linda Mar53.2°F49.5°F57.9°F
Pacifica State Beach53.2°F49.5°F57.9°F
Pacifica54°F50°F58.5°F
Montara53.1°F49.3°F57.7°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 San Francisco 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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