Trunk Bay Sea Temperature
US Virgin Islands · Forecast updated Jul 15, 2026, 06:21 UTC
Current Sea Temperature
28.5°C
83.3°F
Very warm water
Versus this month's average
Close to average
The July average in our archive is 28.6°C (83.4°F).
Recent trend
Holding fairly steady
Seven-day average: 28.5°C, versus 28.6°C in the prior seven days.
What to wear
Very warm water
Swimwear is usually enough; a rash guard adds sun protection.
Cold tolerance varies. Wind, session length, sunshine, and exertion also affect comfort; temperature alone does not mean the sea is safe.
Sea Surface Temperature Over the Year
In the data collected for Trunk Bay, monthly averages range from about 28.2°C (82.8°F) in June to 28.6°C (83.4°F) in July.
Over the past 30 days, the average sea temperature in Trunk Bay has been 28.5°C.
Monthly Water Temperature Averages
| Month | Min | Average | Max |
|---|---|---|---|
| June | 27.8°C / 82.0°F | 28.2°C / 82.8°F | 28.7°C / 83.7°F |
| July | 28.3°C / 82.9°F | 28.6°C / 83.4°F | 28.8°C / 83.8°F |
Profile calculated from 1071 hourly forecast records across 2 monthly periods. This is a growing archive, not a long-term climate normal.
About the water at Trunk Bay
Virgin Islands National Park bay with a marked underwater snorkeling trail.
- Area
- St. John
Trunk Bay Water Temperature — Common Questions
What is the sea temperature in Trunk Bay today?
The current sea surface temperature in Trunk Bay is 28.5°C. Over the last 30 days, the average has been 28.5°C.
When is the water warmest in Trunk Bay?
The warmest monthly average in the Trunk Bay archive is July, at around 28.6°C (83.4°F).
When is the water coldest in Trunk Bay?
The coldest monthly average in the archive is June, at around 28.2°C (82.8°F).
Can you swim in Trunk Bay today?
Yes — at 28.5°C the water is warm enough for comfortable swimming and snorkeling.
Full Snorkeling Forecast
See how today's sea temperature, wave height, wind, and tides combine into a detailed snorkeling score for Trunk Bay.
View Snorkel Forecast →