U.S. Virgin Islands WBGT Heat Safety Center

This is the U.S. Virgin Islands' home for Wet Bulb Globe Temperature, the heat metric that accounts for sun, wind, and humidity together. Check live conditions for all three islands below, learn what the number means, and find guidance tuned to how you spend your time outdoors.

Last updated July 9, 2026 · Live data refreshes every 15 min

Start here

New to WBGT? Two short reads cover almost everything. What is WBGT? explains the formula and the four factors it measures.WBGT vs. the heat index explains why the two numbers disagree outdoors, and why safety officials chose WBGT. If you want to see how the numbers are produced and verified, the methodologypage holds nothing back.

By island

Each island page combines live conditions with its own geography and heat character.

By town

Hyperlocal readings and heat character for the main towns.

Heat safety by audience

The same WBGT reading means different things to a foreman, a coach, and a visitor on day two of vacation. Each guide translates the live band into decisions for that audience.

Glossary, alerts & region

Frequently asked questions

What is the WBGT in the U.S. Virgin Islands today?

It varies by island and time of day. The live cards on this page and the interactive map show the current WBGT for St. Thomas, St. John, and St. Croix, updated every 15 minutes and timestamped in Atlantic Standard Time.

Why does the USVI need its own WBGT tool?

National sources explain WBGT generically and local advisories appear only during heat events. Nowhere else combines a live, island-by-island WBGT map with USVI-specific guidance for workers, coaches, schools, tourists, and event organizers.

Is WBGT usually high in the Virgin Islands?

Through the summer and hurricane season, USVI afternoons frequently reach the elevated and moderate WBGT bands, and exposed sites can hit high threat. The steady trade winds often keep it lower than the humidity alone would suggest, which is exactly why measuring it matters.