Marathon Water Temperature

(Today) 2024

28.4°C / 83.2°F

The water will feel hot. Water temperature similar to a heated indoor swimming pool.

*Live data from Vaca Key, FL: 28.2°C / 82.8°F

Current weather

27°C / 81°F
(overcast clouds)
Partly cloudy
Wind
13 mph
Humidity
83%

The measurements for the water temperature in Marathon, Florida are provided by the daily satellite readings provided by the NOAA. The temperatures given are the sea surface temperature (SST) which is most relevant to recreational users.

*Live data may vary from satellite readings for a number of reasons. These include local factors, depth of smapling and time of day.

Water temp by month

Monthly average max / min water temperatures

The graph below shows the range of monthly Marathon water temperature derived from many years of historical sea surface temperature data.

Marathon average maximum / minimum water temperatures
Maximum and minimum monthly sea temperatures in Marathon
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Min °C 19.8 19.5 20.3 23.5 24.8 27.1 28.3 29.3 28.7 26.3 23.8 22.2
Max °C 23.8 24.1 25.6 27.3 29.3 29.9 31.1 31.7 30.8 30.2 27.9 25
Min °F 69.2 68.9 70.6 75.8 78.4 81.9 84.1 85.7 84.5 80.9 76.4 73.1
Max °F 73.2 73.5 75.9 79.6 82.9 84.7 86.9 88.1 86.6 84.8 80.5 75.9

The warmest water temperature is in August with an average around 86.9°F / 30.5°C. The coldest month is January with an average water temperature of 71.2°F / 21.8°C.

7 day tide forecast for Marathon

ThuFriSatSunMonTueWed
  • High 1:40am
    (0.73m)
  • Low 9:55am
    (0.19m)
  • High 4:11pm
    (0.41m)
  • Low 6:36pm
    (0.4m)
  • High 2:50am
    (0.72m)
  • Low 11:09am
    (0.18m)
  • High 5:56pm
    (0.43m)
  • Low 9:20pm
    (0.41m)
  • High 4:12am
    (0.71m)
  • Low 12:04pm
    (0.16m)
  • High 6:38pm
    (0.48m)
  • Low 11:15pm
    (0.36m)
  • High 5:36am
    (0.72m)
  • Low 12:48pm
    (0.15m)
  • High 7:08pm
    (0.54m)
  • Low 12:27am
    (0.27m)
  • High 6:51am
    (0.73m)
  • Low 1:25pm
    (0.16m)
  • High 7:38pm
    (0.62m)
  • Low 1:27am
    (0.17m)
  • High 7:55am
    (0.73m)
  • Low 1:59pm
    (0.17m)
  • High 8:09pm
    (0.7m)
  • Low 2:21am
    (0.07m)
  • High 8:53am
    (0.72m)
  • Low 2:33pm
    (0.2m)
  • High 8:43pm
    (0.79m)
7 day tide times for Marathon

*These tide times are estimates based on the nearest accurate location (Boot Key Harbor, Vaca Key, Florida) and may differ by up to half an hour depending on distance. Please note, the tide times given are not suitable for navigational purposes.