Heat Index Calculator
Calculate the heat index based on actual air temperature and relative humidity. The heat index represents how hot it actually feels, which is often higher than the actual air temperature due to humidity.
Enter Weather Conditions
Range: -50°C to 60°C (-58°F to 140°F)
%
Range: 0% to 100%
No Results Yet
Enter weather conditions and click calculate to see the heat index.
About Heat Index Calculator
What is Heat Index?
The heat index is a measure of how hot it actually feels when combined with humidity. When humidity is high, the body cannot cool itself effectively through perspiration, making it feel hotter than the actual air temperature. Understanding heat index is crucial for outdoor activities and public health.
Key Features of Heat Index
- Combines air temperature and relative humidity to calculate perceived temperature
- Most accurate for temperatures above 26.7°C (80°F) with humidity above 40%
- Helps determine heat-related health risks and safety guidelines
- Used by weather services and health organizations worldwide
Benefits of Understanding Heat Index
- Better preparation for outdoor activities during hot and humid weather
- Understanding health risks associated with heat stress and heat illness
- Making informed decisions about physical activity, clothing, and hydration