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 85.5°F. Based on our historical data over a period of ten years, the warmest water in this day in Key Largo was recorded in 2023 and was 86.9°F, and the coldest was recorded in 2019 at 83.3°F. Sea water temperature in Key Largo is expected to drop to 84.2°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
| September 25, 2025 |
|---|
| today temp |
| 85.5°F |
| September 24, 2025 |
|---|
| yesterday temp |
| 85.8°F |
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 25, 2025, time in GMT 0 format (you can change the time zone on the sea state forecast page)
| 0-3 h | 3-6 h | 6-9 h | 9-12 h |
|---|---|---|---|
| 0' 8" | 0' 7" | 0' 6" | 0' 6" |
| 0.2 m | 0.17 m | 0.15 m | 0.15 m |
| 12-15 h | 15-18 h | 18-21 h | 21-24 h |
|---|---|---|---|
| 0' 6" | 0' 5" | 0' 5" | 0' 5" |
| 0.14 m | 0.13 m | 0.13 m | 0.13 m |
Surf report in Key Largo
Key Largo weather forecast
Current temperature and weather
Data in a table show Key Largo temperature today (September 25, 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 |
|---|---|---|---|
 |  | |  |
| 83.8°F | 83.5°F | 83.5°F | 83.5°F |
| 12-15 h | 15-18 h | 18-21 h | 21-24 h |
|---|---|---|---|
| |  | |
| 85.3°F | 85.5°F | 84°F | 83.8°F |
You may also be interested in other sections of our site for Key Largo: Sunrise and Sunset, Tides
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
| Month | Avr | Min | Max | |
|---|---|---|---|---|
| January | 75.6°F | 71.2°F | 79.9°F | warm |
| Ocean water temperature in Key Largo in January | ||||
| February | 75.4°F | 70.2°F | 78.8°F | warm |
| Ocean water temperature in Key Largo in February | ||||
| March | 76.5°F | 71.8°F | 80.1°F | warm |
| Ocean water temperature in Key Largo in March | ||||
| April | 78.6°F | 74.3°F | 83.7°F | hot |
| Ocean water temperature in Key Largo in April | ||||
| May | 81.3°F | 77.5°F | 86.7°F | hot |
| Ocean water temperature in Key Largo in May | ||||
| June | 84.2°F | 79.7°F | 87.1°F | hot |
| Ocean water temperature in Key Largo in June | ||||
| July | 85.8°F | 82.6°F | 89.4°F | hot |
| Ocean water temperature in Key Largo in July | ||||
| August | 86.5°F | 82.4°F | 90°F | hot |
| Ocean water temperature in Key Largo in August | ||||
| September | 85.6°F | 82.4°F | 88.3°F | hot |
| Ocean water temperature in Key Largo in September | ||||
| October | 83.1°F | 77.4°F | 86.4°F | hot |
| Ocean water temperature in Key Largo in October | ||||
| November | 79.7°F | 76.1°F | 84.2°F | hot |
| Ocean water temperature in Key Largo in November | ||||
| December | 77.4°F | 73.2°F | 81°F | hot |
| Ocean water temperature in Key Largo in December | ||||
Chart monthly average water temperature in Key Largo
