Understanding WBGT (Wet Bulb Globe Temperature)

What Is WBGT and Why It Matters

Understanding WBGT

Wet Bulb Globe Temperature (WBGT) is a composite heat metric that estimates the effect of temperature, humidity, wind, and sun on the human body. Unlike standard air temperature, WBGT provides a much more accurate assessment of heat stress risk—especially during outdoor sports and physical activity.

WBGT is not what you see on your weather app—it’s a specialized measurement designed for occupational safety, military training, and athletics.

How WBGT Is Calculated

WBGT combines three different temperature readings:

• Dry Bulb (Air Temperature): What a typical thermometer reads.

• Wet Bulb Temperature: Reflects humidity and evaporative cooling (sweat efficiency).

• Globe Temperature: Measures radiant heat from the sun and surfaces.

Each component plays a role:

• High humidity makes it harder for sweat to cool the body.

• Strong sunlight and hot surfaces increase radiant heat load.

• Low wind reduces convective cooling.

Why WBGT Is Better Than Just Air Temperature

Air temperature alone does not account for humidity, sun exposure, or wind—all of which heavily affect how hot your body actually feels and how well it can cool itself.

WBGT reflects how your environment impacts your body’s ability to thermoregulate, making it the most effective heat safety metric for athletes.

Learn more in our article: Heat Index vs. Wet bulb globe temperature