Dry Tortugas Water Temperature
Updated Fri 01:41 (America/New_York)
USA · Forecast updated Sep 25, 2026, 01:41 UTC
Current Sea Temperature
30.9°C
87.6°F
Very warm water
Valid Sep 25, 2026, 01:41 (America/New_York). Source: stored Open-Meteo marine forecast. Temperature is not a safety rating or snorkel score.
Versus this month's average
Close to average
The typical September average is 30.8°C (87.4°F) from the historical baseline.
Recent trend
Cooling by 0.3°C
Seven-day average: 30.9°C, versus 31.3°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 describe sea conditions or replace the snorkel forecast.
Typical Sea Temperature Over the Year
In the historical baseline for Dry Tortugas, typical monthly averages range from about 23.2°C (73.8°F) in January to 31.1°C (88.0°F) in August.
Over the past 30 days, the average sea temperature in Dry Tortugas has been 31.4°C.
Historical baseline (full year)
Northern Hemisphere. Summer is generally June–August; winter is December–February.
Typical monthly sea-surface temperature near Dry Tortugas, calculated from hourly observations for 2023–2025. This is not this site's forecast archive.
| Month | Typical range | Average |
|---|---|---|
| January | 22.9–23.5°C | 23.2°C / 73.8°F |
| February | 22.8–25.1°C | 23.9°C / 75.0°F |
| March | 23.0–25.6°C | 24.4°C / 75.9°F |
| April | 25.1–26.6°C | 25.7°C / 78.3°F |
| May | 27.5–28.7°C | 28.1°C / 82.6°F |
| June | 28.8–29.6°C | 29.3°C / 84.7°F |
| July | 30.0–31.6°C | 30.7°C / 87.3°F |
| August | 30.8–31.6°C | 31.1°C / 88.0°F |
| September | 30.6–30.9°C | 30.8°C / 87.4°F |
| October | 28.3–29.1°C | 28.8°C / 83.8°F |
| November | 26.2–27.0°C | 26.7°C / 80.1°F |
| December | 24.7–25.1°C | 24.9°C / 76.8°F |
Source: Open-Meteo Marine API, MeteoFrance sea-surface temperature dataset. Nearest sea grid cell (24.63, -82.87). Each month is the mean of yearly monthly means; the range is the lowest and highest of those yearly monthly means. Open-Meteo methodology.
Water temperature by month
Each month uses the 2023–2025 baseline. The range is the lowest and highest yearly monthly mean, not an hourly extreme.
Dry Tortugas in January
Typical January water temperature near Dry Tortugas is 23.2°C (73.8°F), with yearly monthly means from 22.9–23.5°C.
Dry Tortugas in February
Typical February water temperature near Dry Tortugas is 23.9°C (75.0°F), with yearly monthly means from 22.8–25.1°C.
Dry Tortugas in March
Typical March water temperature near Dry Tortugas is 24.4°C (75.9°F), with yearly monthly means from 23.0–25.6°C.
Dry Tortugas in April
Typical April water temperature near Dry Tortugas is 25.7°C (78.3°F), with yearly monthly means from 25.1–26.6°C.
Dry Tortugas in May
Typical May water temperature near Dry Tortugas is 28.1°C (82.6°F), with yearly monthly means from 27.5–28.7°C.
Dry Tortugas in June
Typical June water temperature near Dry Tortugas is 29.3°C (84.7°F), with yearly monthly means from 28.8–29.6°C.
Dry Tortugas in July
Typical July water temperature near Dry Tortugas is 30.7°C (87.3°F), with yearly monthly means from 30.0–31.6°C.
Dry Tortugas in August
Typical August water temperature near Dry Tortugas is 31.1°C (88.0°F), with yearly monthly means from 30.8–31.6°C.
Dry Tortugas in September
Typical September water temperature near Dry Tortugas is 30.8°C (87.4°F), with yearly monthly means from 30.6–30.9°C.
Dry Tortugas in October
Typical October water temperature near Dry Tortugas is 28.8°C (83.8°F), with yearly monthly means from 28.3–29.1°C.
Dry Tortugas in November
Typical November water temperature near Dry Tortugas is 26.7°C (80.1°F), with yearly monthly means from 26.2–27.0°C.
Dry Tortugas in December
Typical December water temperature near Dry Tortugas is 24.9°C (76.8°F), with yearly monthly means from 24.7–25.1°C.
Forecast archive (growing)
These values come from hourly forecasts SnorkelForecast has stored. They cover only months with records and do not replace the historical baseline.
| 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 | 30.8°C / 87.5°F | 31.9°C / 89.4°F |
| August | 30.9°C / 87.6°F | 31.5°C / 88.7°F | 32.1°C / 89.8°F |
| September | 30.5°C / 86.9°F | 31.3°C / 88.4°F | 32.2°C / 90.0°F |
Partial coverage: 4 calendar months with records. Profile calculated from 2794 hourly forecast records across 4 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 water temperature in Dry Tortugas today?
The current sea surface temperature near Dry Tortugas is 30.9°C (87.6°F). Over the last 30 days, the average has been 31.4°C.
When is the water warmest in Dry Tortugas?
The water is typically warmest in August, at around 31.1°C (88.0°F) in the 2023–2025 historical baseline.
When is the water coldest in Dry Tortugas?
The water is typically coldest in January, at around 23.2°C (73.8°F) in the same historical baseline.
Can you swim in Dry Tortugas today?
At 30.9°C, the water is usually comfortable for 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 →