# Marathon, Florida Keys water temperature

The sea around Marathon is about 28 °C at the surface right now. Over the next 7 days it stays between 27 °C and 28 °C.

The water stays close to the surface temperature down to about 6–55 m at the sites we follow; deeper it gets colder.

Most divers here need a 3 mm wetsuit today.

## Next 7 days

| Day | Surface |
|---|---|
| Sat 14 Nov | 27–28 °C |
| Sun 15 Nov | 27–28 °C |
| Mon 16 Nov | 27–28 °C |
| Tue 17 Nov | 27–28 °C |
| Wed 18 Nov | 27–28 °C |
| Thu 19 Nov | 27–28 °C |
| Fri 20 Nov | 27–28 °C |

## By dive site

| Site | Now | Today | Warm down to | Suit |
|---|---|---|---|---|
| [Thunderbolt](https://scubaforecast.com/scuba-diving-weather/united-states/florida-keys/marathon/thunderbolt) (Marathon) | 28.0 °C | 28 °C | past 18 m | 3 mm |
| [Adolphus Busch Sr](https://scubaforecast.com/scuba-diving-weather/united-states/florida-keys/marathon/adolphus-busch-sr) (Marathon) | 27.8 °C | 28 °C | ~55 m | 3 mm |
| [Adelaide Baker](https://scubaforecast.com/scuba-diving-weather/united-states/florida-keys/marathon/adelaide-baker) (Marathon) | 27.8 °C | 28 °C | past 6 m | 3 mm |
| [Coffins Patch](https://scubaforecast.com/scuba-diving-weather/united-states/florida-keys/marathon/coffins-patch) (Marathon) | 27.5 °C | 27–28 °C | past 18 m | 3 mm |

Surface temperature from the Open-Meteo marine forecast; temperature at depth, where available, from Copernicus Marine models (daily averages). Both are model estimates.

## Links

- [This page on the web](https://scubaforecast.com/water-temperature/united-states/florida-keys/marathon)
- [Diving conditions in Marathon](https://scubaforecast.com/scuba-diving-weather/united-states/florida-keys/marathon)

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Weather data by Open-Meteo.com (CC BY 4.0). Map data © OpenStreetMap contributors (ODbL). Temperature at depth generated using E.U. Copernicus Marine Service Information.