Saint John Island — Water Temperature, Sea Conditions & Trends
This page provides clear and up-to-date information about water temperature for Saint John Island (United States Virgin Islands). 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 Saint John Island help you plan your visit and choose the best time for swimming.
Current Water Temperature
Water temperature in Saint John Island in the Caribbean Sea today is 28°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
Currently, the sea water temperature at this location matches the average for this day in previous years.
According to our forecast, Water temperature in Saint John Island will be 28.6°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 2 | 27.9°C | 28.0°C | |
| JUN 3 | 27.9°C | 28.5°C | |
| JUN 4 | 28.1°C | 28.5°C | |
| JUN 5 | 28.2°C | 28.8°C | |
| JUN 6 | 28.3°C | 28.8°C | |
| JUN 7 | 28.5°C | 28.5°C | |
| JUN 8 | 28.5°C | 28.5°C | |
| JUN 9 | 28.3°C | 28.8°C | |
| JUN 10 | 28.2°C | 28.8°C | 28.2°C |
| JUN 11 | 28.3°C | 28.3°C | |
| JUN 12 | 28.8°C | 28.3°C | |
| JUN 13 | 29.0°C | 28.4°C | |
| JUN 14 | 28.8°C | 28.4°C | |
| JUN 15 | 28.5°C | 28.5°C | |
| JUN 16 | 28.8°C | 28.6°C | |
| JUN 17 | 28.5°C | 28.6°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
Saint John in the United States Virgin Islands enjoys warm, tropical waters year-round, making it a popular spot for seaside visitors. Sea surface temperatures typically range from about 25°C during the coolest months (late winter) up to around 30°C at the height of summer and early autumn. Most of the year the water sits in the mid to high 20s °C, providing a consistently pleasant swimming environment. Seasonal variation is modest compared with temperate climates, although brief changes can occur with passing weather systems, trade winds and occasional swell events; overall the ocean around Saint John remains comfortably warm for prolonged time in the water.
Monthly Water Temperature Range (Min, Max & Average)
| Month | Min | Avg | Max |
|---|---|---|---|
| January | 25°C | 27°C | 28°C |
| February | 24°C | 26°C | 28°C |
| March | 25°C | 27°C | 28°C |
| April | 25°C | 27°C | 29°C |
| May | 26°C | 28°C | 30°C |
| June | 26°C | 29°C | 30°C |
| July | 27°C | 29°C | 30°C |
| August | 27°C | 29°C | 30°C |
| September | 28°C | 30°C | 31°C |
| October | 27°C | 29°C | 31°C |
| November | 26°C | 29°C | 30°C |
| December | 26°C | 27°C | 29°C |
* Click on a month to view detailed water temperature data.
Saint John Island: Weather Forecast
June 11
June 12
June 13
Location, Beaches & Local Information
Nearby Beaches & Facilities
Genti Bay
Europa Bay
Great Lameshur Bay
Lameshur Beach
Fish Bay
Maho Bay Beach
Klein Bay
Tektite Bay
Cinnamon Bay
Swimming Conditions
Those warm temperatures support a wide array of swimming and beach holiday activities. Many beaches and sheltered bays on and around Saint John feature calm, clear water with good visibility for snorkeling over coral reefs, while open-coast stretches can provide surf and stronger currents for more experienced swimmers and water-sport enthusiasts. Because the water is seldom cold, wetsuits are rarely needed except for extended dives or unusually cool spells. Visitors should still respect local conditions — check wind and swell forecasts, be mindful of rip currents, and take care around coral and marine life — and will find that the consistent, warm sea makes swimming, snorkeling, paddleboarding and casual beach enjoyment possible almost any time of year.