Dry Tortugas Sea Temperature
USA · Forecast updated Jul 15, 2026, 06:21 UTC
Current Sea Temperature
30.3°C
86.5°F
Very warm water
Versus this month's average
0.4°C below
The July average in our archive is 30.7°C (87.3°F).
Recent trend
Cooling by 0.6°C
Seven-day average: 30.5°C, versus 31.1°C in the prior seven days.
What to wear
Very warm water
Swimwear is usually enough; a rash guard adds sun protection.
Cold tolerance varies. Wind, session length, sunshine, and exertion also affect comfort; temperature alone does not mean the sea is safe.
Sea Surface Temperature Over the Year
In the data collected for Dry Tortugas, monthly averages range from about 29.7°C (85.4°F) in June to 30.7°C (87.3°F) in July.
Over the past 30 days, the average sea temperature in Dry Tortugas has been 30.5°C.
Monthly Water Temperature Averages
| Month | Min | Average | Max |
|---|---|---|---|
| June | 28.5°C / 83.3°F | 29.7°C / 85.4°F | 30.8°C / 87.4°F |
| July | 30.1°C / 86.2°F | 30.7°C / 87.3°F | 31.6°C / 88.9°F |
Profile calculated from 1071 hourly forecast records across 2 monthly periods. This is a growing archive, not a long-term climate normal.
About the water at Dry Tortugas
Remote Gulf islands with coral, seagrass and historic Fort Jefferson's moat wall.
- Area
- Florida
Dry Tortugas Water Temperature — Common Questions
What is the sea temperature in Dry Tortugas today?
The current sea surface temperature in Dry Tortugas is 30.3°C. Over the last 30 days, the average has been 30.5°C.
When is the water warmest in Dry Tortugas?
The warmest monthly average in the Dry Tortugas archive is July, at around 30.7°C (87.3°F).
When is the water coldest in Dry Tortugas?
The coldest monthly average in the archive is June, at around 29.7°C (85.4°F).
Can you swim in Dry Tortugas today?
Yes — at 30.3°C the water is warm enough for comfortable swimming and snorkeling.
Full Snorkeling Forecast
See how today's sea temperature, wave height, wind, and tides combine into a detailed snorkeling score for Dry Tortugas.
View Snorkel Forecast →