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Relative humidity is used for the heat index calculations on this page. Relative humidity directly affects how effectively the body can cool itself through sweating by determining the amount of moisture in the air relative to its maximum capacity at a given temperature. This directly impacts human comfort and perception of temperature. Dew point, while related to humidity, doesn't directly convey this relationship and isn't as relevant for calculating the heat index.

This page uses the OpenWeather API - which may take a second or two - to obtain and display the current temperature, relative humidity and "it feels like" temperature. It also uses the latitude and longitude coordinates displayed when you do a city search on their website. As such, the location results may not be 100% accurate (you may get a different Location name below). Furthermore, the heat index value below should not be used as the exact value for wherever you are in that particular country (as temperature and relative humidity may vary based on where you are).

Heat Index ranges --> Possible heat disorders for people in higher risk groups

54.4°C or higher --> Heatstroke/sunstroke highly likely with continued exposure.

40.6°C to 54.4°C --> Sunstroke, heat cramps or heat exhaustion likely, and heat stroke possible with prolonged exposure and/or physical activity.

32.2°C to 40.6°C --> Sunstroke, heat cramps and heat exhaustion possible with prolonged exposure and/or physical activity.

26.7°C to 32.2°C --> Fatigue possible with prolonged exposure and/or physical activity.

(Source of Heat Index ranges and possible disorders: NWS, NOAA).