Looe Key Sea Temperature
Updated Sat 18:26 (America/New_York)
USA · Forecast updated Sep 5, 2026, 18:26 UTC
Current Sea Temperature
31.7°C
89.1°F
Very warm water
Versus this month's average
Close to average
The September average in our archive is 31.5°C (88.6°F).
Recent trend
Holding fairly steady
Seven-day average: 31.4°C, versus 31.5°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 Looe Key, monthly averages range from about 29.9°C (85.8°F) in June to 31.5°C (88.6°F) in September.
Over the past 30 days, the average sea temperature in Looe Key has been 31.2°C.
Monthly Water Temperature Averages
Northern Hemisphere. Summer is generally June–August; winter is December–February.
| Month | Min | Average | Max |
|---|---|---|---|
| June | 28.6°C / 83.5°F | 29.9°C / 85.8°F | 31.2°C / 88.2°F |
| July | 30.3°C / 86.5°F | 31.0°C / 87.7°F | 32.0°C / 89.6°F |
| August | 30.4°C / 86.7°F | 31.2°C / 88.2°F | 32.1°C / 89.8°F |
| September | 31.1°C / 88.0°F | 31.5°C / 88.6°F | 32.0°C / 89.6°F |
Profile calculated from 2331 hourly forecast records across 4 monthly periods. This is a growing archive, not a long-term climate normal.
About the water at Looe Key
Florida Keys sanctuary reef with spur-and-groove coral in clear water.
- Area
- Florida
Looe Key Water Temperature: Common Questions
What is the sea temperature in Looe Key today?
The current sea surface temperature in Looe Key is 31.7°C. Over the last 30 days, the average has been 31.2°C.
When is the water warmest in Looe Key?
The warmest monthly average in the Looe Key archive is September, at around 31.5°C (88.6°F).
When is the water coldest in Looe Key?
The coldest monthly average in the archive is June, at around 29.9°C (85.8°F).
Can you swim in Looe Key today?
At 31.7°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 Looe Key.
View Snorkel Forecast →