Find the heat index from temperature and humidity. Enter the air temperature in Fahrenheit and the relative humidity to get the feels-like temperature and risk level.
This heat index calculator provides general educational information and is not medical advice or an emergency assessment. Follow current local heat alerts and applicable workplace, school, sport, or public-health rules. Stop activity and move to a cooler place if heat-illness symptoms develop. Confusion, collapse, seizures, loss of consciousness, or other severe symptoms require immediate cooling and emergency medical help. Do not rely on the calculated number to rule out heat illness.
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