Key Largo water temp

This data the coastal Key Largo ocean water temperature today, tomorrow and the upcoming days. Besides, you can also get information about the weather and surf forecast, as well as the data on sunrise / sunset and moonrise / moonset at a given point on any given day.

Current ocean temperature in Key Largo

Water temperature in Key Largo today is 87.6°F. Based on our historical data over a period of ten years, the warmest water in this day in Key Largo was, like today, 87.6°F, and the coldest was recorded in 2013 at 83.7°F. Sea water temperature in Key Largo is expected to drop to 85.6°F in the next 10 days. September average water temperature in Key Largo is 85.6°F, the minimum temperature is 82.4°F, and the maximum is 88.3°F.

The swimming season in Key Largo lasts from January to December, twelve months per year! During those months, Key Largo water temperature does not drop below 68°F and therefore suitable for comfortable swimming. The average water temperature in Key Largo in winter reaches 76.1°F, in spring 78.8°F, in summer the average temperature rises to 85.5°F, and in autumn it is 82.8°F.

Key Largo water temperature now

The ocean salinity in Key Largo is 36.47‰, and the average salinity of the World Ocean is 35‰.

Surf Forecast in Key Largo for today

Another important indicators for a comfortable holiday on the beach are the presence and height of the waves, as well as the speed and direction of the wind. Please find below data on the swell size for Key Largo. We calculate the swell size based on the mean wave height (trough to crest) of each third highest wave. For more information on surf forecasts for the next ten days, please visit sea state forecast Key Largo. Data in table shown for September 5, 2025, time in GMT 0 format (you can change the time zone on the sea state forecast page)

Surf report in Key Largo

Key Largo weather forecast

Current temperature and weather

Data in a table show Key Largo temperature today (September 5, 2025). For more information and forecast for a few days, go to the weather forecast Key Largo.

0-3 h	3-6 h	6-9 h	9-12 h
81°F	81.5°F	81.3°F	81.9°F

12-15 h	15-18 h	18-21 h	21-24 h
83.1°F	83.3°F	83.3°F	82.2°F

Key Largo water temperature by month

These figures shows the average, minimum and maximum monthly sea temperature in Key Largo. In addition to the table values, the graph below displays of changes average surface temperature during the year. Values are calculated based on the data over the past 10 years. Using them, you can check the water temperature in Key Largo on any day of this period that interests you. Click on the month link and you will see a table for each day, or alternatively you can view the temperature curve of the month and select 2 different years you want to compare, either in a table or as a curve

Chart monthly average water temperature in Key Largo

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Our report for Key Largo is compiled using satellite data together with in-situ observations to get the most reliable daily data of sea surface temperatures, surf forecasts, current temperatures and weather forecasts.