Heat Safety: Heat Index & WBGT

Avoid heat-related illness at your outdoor work site with this wet bulb temperature safety tool.

Easily get heat index and WBGT values for locations in the USA. Get current conditions and 4-day forecasts.

Weather information is sourced from the National Weather Service.

- Current temperature
- Current humidity
- Current heat index
- Current WBGT (wet bulb globe temperature)
- Heat index forecast
- WBGT forecast

Risk level categorizations for heat index are standardized by the OSHA-NIOSH 3-category scale. Heat categories for WBGT follow the US Army standard.

Display various hot weather measurements including psychrometric wet bulb globe temperature, heat index, temperature, and humidity in order to plan outdoor work activities and risk levels for occupational safety and health. Useful for coaches, managers, and workers.

No login, registration, or subscription required.

Prevent of heat-related illnesses like heat stroke, heat exhaustion, rhabdomyolysis, heat cramps, and heat rash. Implement risk prevention by recognizing hot conditions to avoid the onset of symptoms of weakness, dizziness, and fatigue. Avoid heat-related symptoms and injuries by managing hydration and rest breaks. Schedule outdoor work in advance to avoid extreme weather conditions.

This app is ad-supported with occasional ads. Ads may be removed by upgrading the app with a one-time in-app purchase.

Whether you're managing outdoor crews, coaching a youth sport, or just trying to stay safe in extreme weather, this app gives you a quick read on heat-stress conditions — heat index, wet-bulb temperature, and WBGT — alongside humidity and forecast data. Useful for occupational and athletic heat-safety planning.