°F
°C
Air Temperature
°F
Relative Humidity
%
⚠ Heat index applies above 80°F (27°C) with humidity above 40%.
Calculate Heat Index
← Enter values and click calculate
Heat Index (Feels Like)
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Air Temp
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Humidity
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Feels Hotter By
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Heat Stroke Risk
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Outdoor Activity Recommendation
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Uses the
NWS Heat Index formula
(Rothfusz regression). Valid for temperatures at or above 80°F (27°C) and relative humidity above 40%.