What Is the Heat Index and Why It Matters
The heat index, also known as the “feels-like” temperature, combines air temperature and relative humidity to estimate how hot it really feels to the human body. On hot and humid days, your body’s natural cooling process—sweating—is less effective, increasing the risk of heat stress, exhaustion, and stroke.
This interactive Heat Index Calculator helps you determine how dangerous the current weather conditions are, so you can take appropriate action. Whether you’re working outside, managing an indoor climate, or just planning your day, knowing the heat index can help you stay safe, hydrated, and protected from extreme heat.
Use the tool below to enter the temperature in Celsius and humidity percentage, and get a dynamic result with warnings and suggested safety actions. Perfect for tradespeople, warehouse managers, event planners, and families in the Australian summer heat.