DivePlnr
    Madison Blue Spring dive site
    cave
    Florida Keys, United States

    Madison Blue Spring

    Best months: Apr–Jun

    Why dive here

    With 87+ marine species recorded in the area - including bull sharks, dolphins, hammerhead sharks, seahorses and sea turtles - Madison Blue Spring offers some of Florida Keys's richest cave diving. Water ranges 19-32°C, warmest July, August, September.

    Best timeApr–Jun
    WetsuitA 3mm shorty or thin full wetsuit
    Marine lifeBull Sharks, Dolphins, Hammerhead Sharks, Seahorses and Sea Turtles · 87+ species recorded
    Water19-32°C · warmest July, August, September
    CharacterCave dive
    StandoutRich in charismatic marine life

    Madison Blue Spring offers a cool, clear freshwater dive experience away from the Keys' saltwater reefs. It’s a popular spot for cavern and cave training, with easy access into a well-mapped system. You'll likely spot freshwater residents like longnose gar and American eels, alongside intriguing shells like the Pilsbry tusk shell. Visibility is generally excellent, making it a good choice for divers looking to refine their buoyancy or explore a different side of Florida's underwater world.

    Safety Notes

    Overhead environment - never enter without proper cave/cavern training, redundant equipment, and a guideline.

    Today05:3317:0911h 36m daylightGolden hour 16:37

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    Conditions

    Ocean conditions, forecast and tides for Madison Blue Spring

    Madison Blue Spring Ocean Conditions

    Monthly averages for Madison Blue Spring, sourced from NOAA NDBC + Copernicus Marine (EU) - nearest station: 8725520 - Fort Myers, FL (28km away)

    ExcellentGreatGoodFairPoor★Best monthsThis month

    October Averages

    Sea Temperature

    27°C

    81°F · Range: 20.9–31.1°C

    Air Temperature

    26°C

    79°F

    Current Speed

    0 cm/s

    Direction: S (180°)

    Salinity

    35.98 PSU

    Wind Speed

    2.7 m/s

    5.2 knots

    Atmospheric Pressure

    1014.5 hPa

    Based on 5 years of monitoring data · Data sources: NOAA NDBC + Copernicus Marine (EU)

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