Water temperature in Marco Island (FL) in May
Is it warm enough to swim in Marco Island in May? Average water temperature in Marco Island in May is 81.5°F and therefore suitable for comfortable swimming. The warmest sea in Marco Island in May is 87.8°F, and the coldest is 76.5°F. Average high air temperature in Marco Island in May is 86°F, and average low temperature is 68°F. To find out the sea temperature today and in the coming days, go to Current sea temperature in Marco Island
Changes water temperature in Marco Island in May 2025, 2024
To get an accurate forecast for the water temperature in Marco Island for any chosen month, compare two years within a 10 year range using the chart below. In addition to the sea water temperature in Marco Island, 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:
| Day | 2025 | 2024 | Min | Max |
|---|---|---|---|---|
| May 1 | 79.7°F | 78.1°F | 76.6°F | 81.7°F |
| May 2 | 80.1°F | 79.5°F | 76.5°F | 82.9°F |
| May 3 | 80.1°F | 81.3°F | 77°F | 82.8°F |
| May 4 | 80.8°F | 81.1°F | 77.5°F | 83.1°F |
| May 5 | 80.1°F | 82.2°F | 78.1°F | 83.1°F |
| May 6 | 81.1°F | 81.5°F | 77.7°F | 83.8°F |
| May 7 | 81.7°F | 81.5°F | 77.5°F | 84.4°F |
| May 8 | 82.6°F | 81°F | 77.9°F | 84.2°F |
| May 9 | 82.9°F | 81.9°F | 78.3°F | 84.4°F |
| May 10 | 82.4°F | 82.9°F | 78.4°F | 82.9°F |
| May 11 | 82.6°F | 83.7°F | 78.1°F | 84°F |
| May 12 | 80.6°F | 83.1°F | 78.8°F | 84.4°F |
| May 13 | 81.9°F | 83.8°F | 78.6°F | 84.9°F |
| May 14 | 82.4°F | 84.4°F | 78.1°F | 84.4°F |
| May 15 | 82°F | 85.1°F | 78.3°F | 85.1°F |
| Day | 2025 | 2024 | Min | Max |
|---|---|---|---|---|
| May 16 | 83.1°F | 85.6°F | 78.4°F | 85.6°F |
| May 17 | 83.1°F | 85.8°F | 78.8°F | 85.8°F |
| May 18 | 84.2°F | 86°F | 79°F | 86°F |
| May 19 | 85.3°F | 85.6°F | 79°F | 85.6°F |
| May 20 | 86.2°F | 86.5°F | 79.3°F | 86.5°F |
| May 21 | 85.8°F | 86.5°F | 79.2°F | 86.5°F |
| May 22 | 86.4°F | 86.2°F | 79.2°F | 86.4°F |
| May 23 | 87.4°F | 86.2°F | 79.2°F | 87.4°F |
| May 24 | 87.1°F | 86.7°F | 79.3°F | 87.1°F |
| May 25 | 87.3°F | 86.9°F | 79°F | 87.3°F |
| May 26 | 87.6°F | 86.5°F | 78.4°F | 87.6°F |
| May 27 | 86.5°F | 87.3°F | 78.4°F | 87.3°F |
| May 28 | 86.7°F | 87.8°F | 79°F | 87.8°F |
| May 29 | 87.3°F | 87.4°F | 79.3°F | 87.4°F |
| May 30 | 87.8°F | 87.8°F | 79°F | 87.8°F |
| May 31 | 87.1°F | 87.8°F | 79.2°F | 87.8°F |
Average water temperature in Marco Island in May over a decade
| 2016 | 2017 | 2018 | 2019 | 2020 |
| 81.7°F | 81.3°F | 79.3°F | 82.9°F | 80.6°F |
| 2021 | 2022 | 2023 | 2024 | 2025 |
| 82°F | 82.8°F | 82.8°F | 84.4°F | 83.8°F |
Marco Island sea state in May
Chart comparing the height of waves in Marco Island 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.
Weather and climate in Marco Island in May
This data display average monthly climate indicators in Marco Island in May 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 temperature86°F
- Average LOW temperature68°F
- Average rainfall days8 days
- Average rainfall104mm/4.1''
- Average daylight13h
- Average sunshine10h
- Average UV index11
Marco Island water temperature during other months:
You can also view information about water temperature for other months by clicking on the month button below
