Blue Grotto Spring
Protected Area
Waccasassa Bay State Preserve
Why dive here
With 87+ marine species recorded in the area - including bull sharks, dolphins, hammerhead sharks, seahorses and sea turtles - Blue Grotto Spring offers some of Florida Keys's richest cave diving. Water ranges 19-32°C, warmest July, August, September.
Blue Grotto Spring is a freshwater cavern dive with a large open entrance. Descend into a vast, dark chamber, lit only by divers' lights. It’s a good spot for new cavern divers to practice their skills in a controlled environment. We’ve seen Eastern Mosquitofish darting around the edges of the light.
Safety Notes
Overhead environment - never enter without proper cave/cavern training, redundant equipment, and a guideline.
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Conditions
Ocean conditions, forecast and tides for Blue Grotto Spring
Blue Grotto Spring Ocean Conditions
Monthly averages for Blue Grotto Spring, sourced from NOAA buoy & Copernicus Marine data - nearest station: 8725520 - Fort Myers, FL (28km away)
August Averages
Sea Temperature
31.52°C
89°F · Range: 27.7–35.7°C
Air Temperature
28.3°C
83°F
Current Speed
1 cm/s
Direction: W (270°)
Salinity
36.45 PSU
Wind Speed
2.2 m/s
4.3 knots
Atmospheric Pressure
1015.7 hPa
Based on 5 years of monitoring data · Data sources: NOAA NDBC + Copernicus Marine (EU)
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