Buck Island Sea Temperature

Updated Sat 16:40 (America/St_Thomas)

US Virgin Islands · Forecast updated Sep 5, 2026, 16:40 UTC

Current Sea Temperature

29.7°C

85.5°F

Very warm water

Versus this month's average

Close to average

The September average in our archive is 29.7°C (85.4°F).

Recent trend

Warming by 0.3°C

Seven-day average: 29.6°C, versus 29.3°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 describe sea conditions.

Sea Surface Temperature Over the Year

In the data collected for Buck Island, monthly averages range from about 28.3°C (83.0°F) in June to 29.7°C (85.4°F) in September.

Over the past 30 days, the average sea temperature in Buck Island has been 29.3°C.

Northern Hemisphere. Summer is generally June–August; winter is December–February.

Month	Min	Average	Max
June	28.0°C / 82.4°F	28.3°C / 83.0°F	28.7°C / 83.7°F
July	28.4°C / 83.1°F	28.7°C / 83.6°F	29.2°C / 84.6°F
August	28.8°C / 83.8°F	29.2°C / 84.6°F	29.9°C / 85.8°F
September	29.4°C / 84.9°F	29.7°C / 85.4°F	30.0°C / 86.0°F

Profile calculated from 2329 hourly forecast records across 4 monthly periods. This is a growing archive, not a long-term climate normal.

National monument with an underwater trail through an elkhorn coral barrier reef.

The current sea surface temperature in Buck Island is 29.7°C. Over the last 30 days, the average has been 29.3°C.

The warmest monthly average in the Buck Island archive is September, at around 29.7°C (85.4°F).

The coldest monthly average in the archive is June, at around 28.3°C (83.0°F).

At 29.7°C, the water is usually comfortable for swimming and snorkeling.

See how today's sea temperature, wave height, wind, and tides combine into a detailed snorkeling score for Buck Island.