Trunk Bay — Sea temperature now
Underwater snorkel trail in Virgin Islands NP.
Very warm water with a light chop and a light breeze — great swimming conditions.
Location
Trunk Bay on the map, with nearby beaches and live sea temperatures.
7-day forecast
Water, air, waves, wind and UV outlook for the week ahead.
Monthly sea temperature averages
Typical year-round water temperature, based on regional climatology.
Best time to swim in Trunk Bay
The sea in Trunk Bay peaks in July, when the water averages around 29°C.
The main swimming season runs from January – December, when surface temperatures stay comfortable for extended sessions.
On average, 12 months a year sit above 20°C — the threshold most swimmers describe as pleasant without a wetsuit.
The coldest month is typically January at around 26°C, when cold-water swimmers dominate the coast.
Trunk Bay sea temperature history
Long-term climatology for Trunk Bay shows an annual mean sea temperature of 28°C, ranging from 26°C in winter to 29°C at the summer peak.
The seasonal swing is roughly 3°C between the coldest and warmest month — a useful yardstick when comparing years or checking whether the current sea is running above or below average.
Recent decades have trended slightly warmer at Trunk Bay, in line with regional sea-surface temperature records for the wider basin.
Monthly averages below are drawn from multi-decadal climatology and are updated as new observations arrive.
Trunk Bay sea temperature: frequently asked questions
What is the warmest month to swim in Trunk Bay?
July is the warmest month in Trunk Bay, when the sea averages about 29°C. Late-season warmth often persists a few weeks after peak.
When is the sea coldest in Trunk Bay?
The coldest month in Trunk Bay is typically January, when the water averages around 26°C. Cold-water swimmers and surfers dominate this period.
When can you swim in Trunk Bay without a wetsuit?
The main swimming season in Trunk Bay runs from January – December — about 12 months a year when the sea sits above 20°C, the level most swimmers describe as pleasant without a wetsuit.
Do I need a wetsuit in Trunk Bay?
Trunk Bay stays warm year-round, so most swimmers never need a wetsuit — a rash guard is usually enough for sun and wildlife protection.
What is the average sea temperature in Trunk Bay?
The long-term annual mean sea temperature in Trunk Bay is about 28°C, based on multi-decadal climatology of the surrounding waters.
How do I check the current sea temperature in Trunk Bay?
The live reading at the top of this page shows the current sea temperature in Trunk Bay, updated hourly from marine buoy and satellite data. The 7-day forecast covers water, air, waves, wind and UV for the week ahead.
Year-round sea temperature
Best swim months: Jan – Feb – Mar – Apr – May – Jun – Jul – Aug – Sep – Oct – Nov – Dec
| Month | Sea | Comfort |
|---|---|---|
| Jan | 26°C | Hot |
| Feb | 26°C | Hot |
| Mar | 26°C | Hot |
| Apr | 27°C | Hot |
| May | 28°C | Hot |
| Jun | 28°C | Hot |
| Jul ⭐ | 29°C | Hot |
| Aug | 29°C | Hot |
| Sep | 29°C | Hot |
| Oct | 29°C | Hot |
| Nov | 28°C | Hot |
| Dec | 27°C | Hot |