INSTRUMENT / SEA TEMPERATURE
Dry Tortugas Water Temperature
Updated Mon 13:54 (America/New_York)
USA · Forecast updated Nov 9, 2026, 13:54 UTC
Current Sea Temperature
28.2°C
82.8°F
Very warm water
Valid Nov 9, 2026, 13:54 (America/New_York). Source: stored Open-Meteo marine forecast. Temperature is not a safety rating or snorkel score.
Versus this month's average
1.5°C above
The typical November average is 26.7°C (80.1°F) from the historical baseline.
Recent trend
Warming by 0.3°C
Seven-day average: 28.5°C, versus 28.2°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 28.8°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 2022–2025. 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 | 24.7–25.6°C | 25.1°C / 77.2°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 2022–2025 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.
Swimming and snorkeling: mild water. A rash guard is useful; cold-sensitive snorkelers may prefer a shorty wetsuit.
Adjacent months: December 25.1°C · February 23.9°C.
Explore Dry Tortugas sea temperature in January, including swim comfort and month comparisons →
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.
Swimming and snorkeling: mild water. A rash guard is useful; cold-sensitive snorkelers may prefer a shorty wetsuit.
Adjacent months: January 23.2°C · March 24.4°C.
Explore Dry Tortugas sea temperature in February, including swim comfort and month comparisons →
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.
Swimming and snorkeling: mild water. A rash guard is useful; cold-sensitive snorkelers may prefer a shorty wetsuit.
Adjacent months: February 23.9°C · April 25.7°C.
Explore Dry Tortugas sea temperature in March, including swim comfort and month comparisons →
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.
Swimming and snorkeling: warm water. Most people are comfortable in swimwear or a light rash guard.
Adjacent months: March 24.4°C · May 28.1°C.
Explore Dry Tortugas sea temperature in April, including swim comfort and month comparisons →
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.
Swimming and snorkeling: very warm water. Swimwear is usually enough; a rash guard adds sun protection.
Adjacent months: April 25.7°C · June 29.3°C.
Explore Dry Tortugas sea temperature in May, including swim comfort and month comparisons →
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.
Swimming and snorkeling: very warm water. Swimwear is usually enough; a rash guard adds sun protection.
Adjacent months: May 28.1°C · July 30.7°C.
Explore Dry Tortugas sea temperature in June, including swim comfort and month comparisons →
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.
Swimming and snorkeling: very warm water. Swimwear is usually enough; a rash guard adds sun protection.
Adjacent months: June 29.3°C · August 31.1°C.
Explore Dry Tortugas sea temperature in July, including swim comfort and month comparisons →
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.
Swimming and snorkeling: very warm water. Swimwear is usually enough; a rash guard adds sun protection.
Adjacent months: July 30.7°C · September 30.8°C.
Explore Dry Tortugas sea temperature in August, including swim comfort and month comparisons →
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.
Swimming and snorkeling: very warm water. Swimwear is usually enough; a rash guard adds sun protection.
Adjacent months: August 31.1°C · October 28.8°C.
Explore Dry Tortugas sea temperature in September, including swim comfort and month comparisons →
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.
Swimming and snorkeling: very warm water. Swimwear is usually enough; a rash guard adds sun protection.
Adjacent months: September 30.8°C · November 26.7°C.
Explore Dry Tortugas sea temperature in October, including swim comfort and month comparisons →
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.
Swimming and snorkeling: warm water. Most people are comfortable in swimwear or a light rash guard.
Adjacent months: October 28.8°C · December 25.1°C.
Explore Dry Tortugas sea temperature in November, including swim comfort and month comparisons →
Dry Tortugas in December
Typical December water temperature near Dry Tortugas is 25.1°C (77.2°F), with yearly monthly means from 24.7–25.6°C.
Swimming and snorkeling: warm water. Most people are comfortable in swimwear or a light rash guard.
Adjacent months: November 26.7°C · January 23.2°C.
Explore Dry Tortugas sea temperature in December, including swim comfort and month comparisons →
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 | 30.2°C / 86.4°F | 31.2°C / 88.2°F | 32.2°C / 90.0°F |
| October | 27.7°C / 81.9°F | 29.3°C / 84.7°F | 30.4°C / 86.7°F |
| November | 28.0°C / 82.4°F | 28.4°C / 83.1°F | 28.9°C / 84.0°F |
Partial coverage: 6 calendar months with records. Profile calculated from 3886 hourly forecast records across 6 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 28.2°C (82.8°F). Over the last 30 days, the average has been 28.8°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 2022–2025 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 28.2°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 →