Key Largo — Water Temperature, Sea Conditions & Trends
This page provides clear and up-to-date information about water temperature for Key Largo (Florida, United States). It includes the current water temperature, daily data for the last month presented in a simple chart, and a 7-day forecast. The page also compares today’s value with typical averages for this period, shows usual monthly ranges during the year, and lists nearby beaches with short descriptions. Local weather for the next few days and general details about Key Largo help you plan your visit and choose the best time for swimming.
Current Water Temperature
Water temperature in Key Largo in the Atlantic Ocean today is 29°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
✅ As of today, the minimum water temperature is above 82°F (28°C). This is very warm water, which may feel almost hot to most people. Swimming in such conditions is perfect for those seeking relaxation and comfort in the water. These waters are often preferred for relaxation in hot weather, as the water temperature does not cool the body significantly. However, it is important to remember that in such warm waters, caution is necessary, as prolonged exposure without rest can lead to overheating.
It is important to note that these swimming tips and recommendations apply only in good weather. When the air temperature is below 68°F (20°C), and sometimes even below 77°F (25°C), swimming can be unpleasant even with relatively high water temperatures.
Water Temperature Chart Over the Last 30 Days
Water temperature in Key Largo today is lower than both a week ago and a month ago. Currently, the sea water temperature at this location matches the average for this day in previous years.
According to our forecast, Water temperature in Key Largo will be 29.0°C in the next 7 days. See the table below for daily data for the upcoming week.
Table of Daily Sea Temperature Data
| Date | Current | Average | Forecast |
|---|---|---|---|
| JUN 1 | 29.3°C | 29.8°C | |
| JUN 2 | 29.7°C | 28.8°C | |
| JUN 3 | 29.8°C | 29.0°C | |
| JUN 4 | 30.2°C | 28.8°C | |
| JUN 5 | 30.0°C | 29.0°C | |
| JUN 6 | 29.5°C | 28.3°C | |
| JUN 7 | 28.9°C | 28.3°C | |
| JUN 8 | 28.4°C | 28.5°C | |
| JUN 9 | 29.0°C | 28.5°C | 29.0°C |
| JUN 10 | 28.8°C | 29.0°C | |
| JUN 11 | 28.5°C | 29.0°C | |
| JUN 12 | 29.0°C | 29.0°C | |
| JUN 13 | 28.8°C | 29.0°C | |
| JUN 14 | 29.0°C | 29.0°C | |
| JUN 15 | 28.5°C | 29.0°C | |
| JUN 16 | 28.8°C | 29.0°C |
* Current - Actual water temperature value
** Average - Average water temperature on this day in recent years
*** Forecast - Our water temperature forecast
Actual nearshore water temperatures may fluctuate by several degrees from the reported values, especially following heavy rainfall or extended periods of strong winds. Certain wind patterns can cause colder, deeper waters to rise and replace the sun-warmed surface water, leading to noticeable variations.
Our forecast is based on a proprietary mathematical model that considers real-time water temperature changes, historical trends, key weather patterns, wind strength and direction, and air temperature specific to each region. Additionally, we incorporate data from other resorts to enhance accuracy.
Water temperature data for this location is gathered from various sources, including buoys and satellite sea and ocean surface maps provided by the NOAA agency. We also incorporate data from local authorities in each specific location worldwide to ensure more accurate temperature readings.
Annual Water Temperature Overview by Month
Monthly Water Temp Ranges
Annual Water Temperature Trend
Key Largo, the northernmost of the Florida Keys, enjoys a subtropical marine climate and warm, clear water influenced by the nearby Gulf Stream. Sea surface temperatures vary through the year but remain inviting compared with many continental coasts: winter months typically see temperatures around 22–24°C, spring warms to roughly 24–27°C, summer peaks in the range of 28–31°C, and autumn usually holds between 26–29°C. These conditions support abundant marine life and coral communities close to shore, and water clarity is generally good, though local weather and passing storms can reduce visibility at times.
Monthly Water Temperature Range (Min, Max & Average)
| Month | Min | Avg | Max |
|---|---|---|---|
| January | 19°C | 22°C | 26°C |
| February | 19°C | 23°C | 27°C |
| March | 20°C | 24°C | 28°C |
| April | 22°C | 26°C | 29°C |
| May | 24°C | 28°C | 33°C |
| June | 26°C | 29°C | 32°C |
| July | 27°C | 30°C | 34°C |
| August | 28°C | 31°C | 34°C |
| September | 27°C | 30°C | 33°C |
| October | 24°C | 28°C | 31°C |
| November | 21°C | 25°C | 29°C |
| December | 20°C | 23°C | 28°C |
* Click on a month to view detailed water temperature data.
Key Largo: Weather Forecast
June 10
June 11
June 12
June 13
Location, Beaches & Local Information
Nearby Beaches & Facilities
Cannon Beach
Harry Harris Beach Park
Swimming Conditions
For swimmers and beachgoers, Key Largo offers a wide range of aquatic experiences that suit both relaxed bathing and active water sports. Shallow, protected bays and mangrove-fringed inlets provide calm spots for families to wade and swim, while the nearby coral reefs make snorkeling and scuba diving among the most popular activities; many sites are accessible via short boat rides. During summer and early autumn, warmer temperatures and high visibility make prolonged surface swims and extended snorkel sessions comfortable, whereas winter water at about 22–24°C may feel brisk to some visitors, prompting lightweight thermal layers or shorter swims. Kayaking, paddleboarding and glass-bottom boat tours are additional options for those who prefer gentler water time, but as always it’s sensible to be aware of local conditions, currents and marine life when planning a beach or water-based holiday.