Saint Thomas Island — Water Temperature, Sea Conditions & Trends
This page provides clear and up-to-date information about water temperature for Saint Thomas 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 Thomas Island help you plan your visit and choose the best time for swimming.
Current Water Temperature
Water temperature in Saint Thomas 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
Water temperature in Saint Thomas Island has risen over the last week and month. 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 Thomas Island will be 28.4°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 | 27.7°C | 28.0°C | |
| JUN 3 | 27.7°C | 28.0°C | |
| JUN 4 | 27.8°C | 28.5°C | |
| JUN 5 | 27.8°C | 28.0°C | |
| JUN 6 | 27.9°C | 28.5°C | |
| JUN 7 | 28.1°C | 28.3°C | |
| JUN 8 | 28.2°C | 28.8°C | |
| JUN 9 | 28.1°C | 28.3°C | |
| JUN 10 | 28.1°C | 28.3°C | 28.1°C |
| JUN 11 | 28.8°C | 28.1°C | |
| JUN 12 | 28.8°C | 28.2°C | |
| JUN 13 | 28.8°C | 28.2°C | |
| JUN 14 | 28.3°C | 28.3°C | |
| JUN 15 | 28.3°C | 28.3°C | |
| JUN 16 | 28.5°C | 28.3°C | |
| JUN 17 | 29.0°C | 28.4°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 Thomas, in the United States Virgin Islands, sits in the warm Caribbean Sea and enjoys fairly stable tropical water temperatures year-round. Sea surface temperatures typically range from about 26 °C in the coolest months to roughly 29–30 °C at the height of summer. More specifically, winter (December–February) water tends to hover around 26–27 °C, spring (March–May) commonly falls in the 26–28 °C band, summer (June–September) warms to about 28–30 °C, and autumn (October–November) usually remains near 27–29 °C. Local conditions can vary by a degree or two depending on depth, proximity to reef-protected bays and occasional seasonal currents, with shallow lagoons and sheltered coves often feeling warmer than the open sea.
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 | 29°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 | 27°C | 30°C | 31°C |
| October | 27°C | 29°C | 31°C |
| November | 26°C | 29°C | 31°C |
| December | 25°C | 28°C | 29°C |
* Click on a month to view detailed water temperature data.
Saint Thomas Island: Weather Forecast
June 11
June 12
June 13
Location, Beaches & Local Information
Nearby Beaches & Facilities
Crown Bay
Lindbergh Beach
Banana Bay
Krum Bay
Ruyter Bay
Emerald Beach Resort
Limestone Beach
Revenge Bay
Elephant Bay
Swimming Conditions
These consistently warm temperatures make Saint Thomas attractive for swimming and a broad range of water-based holiday activities throughout the year. Popular beaches and sheltered spots offer gentle, swim-friendly water ideal for families and casual bathing, while clear visibility around reefs supports snorkeling, freediving, and scuba diving most months. Paddle sports and boat trips to nearby cays are common, and swimmers can generally go without wetsuits except for personal comfort. Visitors should note that summer and early fall, while warmest, coincide with the hurricane season and can bring choppier seas and occasional restrictions on water access; winter trade winds may create surfier exposures on windward shores. Overall, the island’s sea temperatures and coastal variety suit both relaxed beach stays and active marine recreation.