Key Largo Sea Temperature
Updated Tue 00:14 (America/New_York)
USA · Forecast updated Aug 11, 2026, 00:14 UTC
Current Sea Temperature
31.2°C
88.2°F
Very warm water
Versus this month's average
0.4°C below
The August average in our archive is 31.6°C (88.9°F).
Recent trend
Holding fairly steady
Seven-day average: 31.5°C, versus 31.7°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.
Sea Surface Temperature Over the Year
In the data collected for Key Largo, monthly averages range from about 30.5°C (86.9°F) in June to 31.6°C (88.9°F) in August.
Over the past 30 days, the average sea temperature in Key Largo has been 31.4°C.
Monthly Water Temperature Averages
| Month | Min | Average | Max |
|---|---|---|---|
| June | 28.5°C / 83.3°F | 30.5°C / 86.9°F | 31.9°C / 89.4°F |
| July | 30.6°C / 87.1°F | 31.3°C / 88.3°F | 32.1°C / 89.8°F |
| August | 30.8°C / 87.4°F | 31.6°C / 88.9°F | 32.5°C / 90.5°F |
Profile calculated from 1713 hourly forecast records across 3 monthly periods. This is a growing archive, not a long-term climate normal.
About the water at Key Largo
Gateway to John Pennekamp park and the shallow Florida Keys reef tract.
- Area
- Florida
Key Largo Water Temperature: Common Questions
What is the sea temperature in Key Largo today?
The current sea surface temperature in Key Largo is 31.2°C. Over the last 30 days, the average has been 31.4°C.
When is the water warmest in Key Largo?
The warmest monthly average in the Key Largo archive is August, at around 31.6°C (88.9°F).
When is the water coldest in Key Largo?
The coldest monthly average in the archive is June, at around 30.5°C (86.9°F).
Can you swim in Key Largo today?
At 31.2°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 Key Largo.
View Snorkel Forecast →