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Water temperature in Grassy Key (FL) in April

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Is it warm enough to swim in Grassy Key in April? Average water temperature in Grassy Key in April is 78.6°F and therefore suitable for comfortable swimming. The warmest sea in Grassy Key in April is 83.3°F, and the coldest is 74.1°F. To find out the sea temperature today and in the coming days, go to Current sea temperature in Grassy Key

Changes water temperature in Grassy Key in April 2025, 2024

To get an accurate forecast for the water temperature in Grassy Key for any chosen month, compare two years within a 10 year range using the chart below. In addition to the sea water temperature in Grassy Key, 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 178.6°F75.9°F74.1°F79.3°F
April 279.7°F76.8°F74.1°F80.2°F
April 379.7°F77.2°F75°F80.1°F
April 479.7°F77.4°F74.7°F80.1°F
April 579.3°F76.8°F74.5°F80.1°F
April 679.7°F76.8°F74.5°F79.9°F
April 779.5°F76.8°F74.3°F80.1°F
April 879.2°F76.6°F75.2°F80.6°F
April 978.8°F76.6°F76.1°F80.1°F
April 1078.6°F76.8°F75.9°F80.2°F
April 1178.4°F76.1°F76.1°F80.8°F
April 1278.6°F77.5°F76.6°F80.8°F
April 1377.4°F77.2°F76.1°F80.8°F
April 1478.1°F76.8°F76.3°F81.1°F
April 1578.1°F76.6°F75.9°F81.5°F
Day 2025 2024 Min Max
April 1677.9°F76.6°F76.3°F82.9°F
April 1778.1°F77.2°F75.9°F82.9°F
April 1877.9°F77.7°F76.3°F82.9°F
April 1978.3°F77.9°F76.1°F82.8°F
April 2078.4°F78.3°F76.3°F83.3°F
April 2178.4°F78.6°F76.8°F82.8°F
April 2278.3°F78.4°F76.3°F82.8°F
April 2378.6°F79°F76.6°F82.8°F
April 2478.4°F79.5°F76.5°F82.4°F
April 2578.6°F79.7°F76.6°F82.6°F
April 2679.3°F79.3°F77.2°F83.1°F
April 2779.5°F79.3°F77°F83.1°F
April 2879.3°F79.2°F77°F83.3°F
April 2979.9°F79.2°F77.4°F82.2°F
April 3079.7°F79.5°F77.4°F81.5°F
Grassy Key water temp chart in April

Average water temperature in Grassy Key in April over a decade

20162017201820192020
78.4°F78.3°F78.8°F79°F81°F
20212022202320242025
78.4°F79.2°F80.1°F77.7°F78.8°F

Grassy Key sea state in April

Chart comparing the height of waves in Grassy Key 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 Grassy Key in April

Grassy Key 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 Florida in April

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

AvrMinMax
Sarasota74.5°F64.6°F80.8°F
Key West78.3°F73.2°F83.3°F
Naples76.5°F66.9°F83.7°F
Miami Beach78.8°F74.3°F82.6°F
Fort Myers Beach76.3°F66.4°F82.9°F
Destin69.6°F63.5°F77.4°F
Fort Lauderdale78.6°F72.9°F82°F
Key Largo78.6°F74.3°F83.7°F
Cocoa Beach74.1°F68.7°F78.4°F
Clearwater Beach73.9°F63.7°F79.7°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 Grassy Key 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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