Weather on the island of St. Thomas is pretty similar year round. It always feel like great summer weather and usually doesn’t get cold. St. Thomas does not experience significant seasonal changes, therefore weather and temperatures are pretty much the same regardless of what month it is.
The warmest months on the island of St. Thomas are usually the months of June, July and August, with temperatures usually in the mid 80s and December through February cooler months with high temperatures of 70 degrees.
The hottest temperature recorded between 1972 and 2004 was 99 degrees. This heat was experienced in August of 1979, July of 1988 and June of 1996. The lowest temperature recorded was 52 degrees in November 1999 on the island St. Thomas.
Water temperatures on the island of St. Thomas do not change greatly from summer to winter, however the 4 or 5 degree change is noticeable to those acclimated to consistently warm tropical weather. In the summer months the water temperature is about 83 degrees and in the winter about 79 degrees.
The island of St. Thomas does not have a rainy season, however there are month to month differences. The rainiest months on the island of St. Thomas are May, August, September, October and November. Rainy months does not mean that there is continuous rainfall every day all month long, in fact most daily rainfall reports are below .10 inches. Rain showers are often short and typically occur early in the morning or at night.
On a truly rainy day, it will rain off and on for the entire day. All day downpours over numerous days are not common. The driest months are usually the months of February and March. In November of 2003, the USVI experienced record breaking rainfall, with the island of St. Thomas had 18.39 inches of rain. Droughts are a larger problem because the islands are dependent on rain as a source of water.
One of the greatest natural threats in the USVI is hurricanes. Atlantic hurricane season runs from June 1st to November 30th with the highest occurrences of storms in August and September.