Water temperature in Key Biscayne (FL) in March
Is it warm enough to swim in Key Biscayne in March? Average water temperature in Key Biscayne in March is 76.6°F and therefore suitable for comfortable swimming. The warmest sea in Key Biscayne in March is 80.1°F, and the coldest is 71.8°F. Average high air temperature in Key Biscayne in March is 79°F, and average low temperature is 64°F. To find out the sea temperature today and in the coming days, go to Current sea temperature in Key Biscayne
Changes water temperature in Key Biscayne in March 2026, 2025
To get an accurate forecast for the water temperature in Key Biscayne for any chosen month, compare two years within a 10 year range using the chart below. In addition to the sea water temperature in Key Biscayne, the selected years in the table also show the values of the maximum and minimum temperatures on each of the days of March.
You can choose any other years:
| Day | 2026 | 2025 | Min | Max |
|---|---|---|---|---|
| March 1 | 75.4°F | 76.5°F | 73.4°F | 79°F |
| March 2 | 74.8°F | 75.6°F | 72.5°F | 79°F |
| March 3 | 75.4°F | 75.9°F | 71.8°F | 79°F |
| March 4 | 75.9°F | 75.7°F | 72.1°F | 79.3°F |
| March 5 | 76.5°F | 75.9°F | 72.7°F | 78.8°F |
| March 6 | 77.2°F | 75.2°F | 72.5°F | 78.6°F |
| March 7 | 77.7°F | 75.4°F | 71.8°F | 78.6°F |
| March 8 | 77.7°F | 75.7°F | 71.8°F | 79°F |
| March 9 | 78.1°F | 75.6°F | 72.9°F | 78.4°F |
| March 10 | 78.4°F | 75.4°F | 72.3°F | 78.8°F |
| March 11 | 78.4°F | 75.2°F | 72.5°F | 79.3°F |
| March 12 | 78.4°F | 75.6°F | 72.5°F | 79°F |
| March 13 | 75.2°F | 72.9°F | 78.1°F | |
| March 14 | 76.1°F | 72.9°F | 77.9°F | |
| March 15 | 75.9°F | 73.2°F | 78.3°F |
| Day | 2026 | 2025 | Min | Max |
|---|---|---|---|---|
| March 16 | 76.3°F | 73.4°F | 78.6°F | |
| March 17 | 75.9°F | 73°F | 78.3°F | |
| March 18 | 75.7°F | 73.4°F | 78.4°F | |
| March 19 | 75.7°F | 74.1°F | 78.6°F | |
| March 20 | 75.7°F | 73.4°F | 79.2°F | |
| March 21 | 76.3°F | 73.9°F | 79°F | |
| March 22 | 76.3°F | 74.1°F | 78.6°F | |
| March 23 | 74.3°F | 73.8°F | 78.6°F | |
| March 24 | 77.7°F | 74.3°F | 79.2°F | |
| March 25 | 77.4°F | 74.3°F | 79.5°F | |
| March 26 | 76.5°F | 74.1°F | 79.9°F | |
| March 27 | 77.7°F | 74.7°F | 79.5°F | |
| March 28 | 77.2°F | 74.3°F | 79°F | |
| March 29 | 77°F | 74.1°F | 78.8°F | |
| March 30 | 76.5°F | 74.1°F | 79.5°F | |
| March 31 | 77.4°F | 74.7°F | 80.1°F |
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Average water temperature in Key Biscayne in March over a decade
| 2016 | 2017 | 2018 | 2019 | 2020 |
| 77°F | 76.8°F | 76.5°F | 78.1°F | 77.5°F |
| 2021 | 2022 | 2023 | 2024 | 2025 |
| 77.2°F | 78.1°F | 77.7°F | 76.8°F | 76.1°F |
Key Biscayne sea state in March
Chart comparing the height of waves in Key Biscayne in March 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.
Weather and climate in Key Biscayne in March
This data display average monthly climate indicators in Key Biscayne in March 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 temperature79°F
- Average LOW temperature64°F
- Average rainfall days7 days
- Average rainfall64mm/2.5''
Key Biscayne water temperature during other months:
You can also view information about water temperature for other months by clicking on the month button below
