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Heat Index Calculator – Calculates how hot it actually feels by combini...

The Heat Index Calculator calculates how hot it actually feels by combining temperature and humidity. This Heat Index Calculator applies the standard meteorological formula to calculate the result from your inputs. Conditions change rapidly — check an official forecast for current and forecast data.

The formula behind this calculator: Uses the NOAA heat index regression formula based on air temperature and relative humidity. As a practical example: 95°F at 50% humidity produces a heat index (feels-like temperature) of about 107°F. All results are calculated instantly in your browser — no data is stored or transmitted.

Heat Index Calculator FAQ

What does the Heat Index Calculator calculate?

Calculates how hot it actually feels by combining temperature and humidity.

At what conditions does wind chill apply?

The NWS wind chill formula applies when temperatures are at or below 50°F (10°C) and wind speed is at least 3 mph. It's not meaningful in warm conditions.

Why does the feels-like temperature differ from the actual temperature?

Heat index (humidity effect) and wind chill (wind effect) calculate how temperature feels to the human body, not the measured air temperature. High humidity prevents sweat evaporation; wind increases heat loss from skin.

Is my data sent to a server?

No — calculations run directly in your browser. Your inputs are not stored or transmitted.