Community health / James Sun & Philip Sun · SurfAI

Heat & health explorer

Explore heat index, then plan with official guidance.

Try a weather scenario.

Heat index combines air temperature and relative humidity. This educational calculator uses the National Weather Service method for shaded conditions.

Use the forecast for your location.

For real planning, check the CDC HeatRisk dashboard or National Weather Service. Heat index and HeatRisk are different measures.

Build a practical plan

Find air-conditioned spaces or shaded breaks.
Check on people who may need help keeping cool.
Adjust outdoor activity to cooler parts of the day.

Educational scenario

Apparent temperature

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Enter conditions to calculate.

Illustrative chart scale: 0–160°F. Calculation results may exceed the chart range.

Make the science useful.

This explorer calculates an environmental index. It does not estimate your probability of heat illness. Individual vulnerability, direct sunlight, physical activity, medications, and other factors can change risk.

If someone is confused, collapses, or may have heat stroke, call 911 and begin cooling them while help is on the way.

Source: CDC heat and health guidance and NWS heat-index equation.