Heat Index Calculator

Calculate the "feels like" temperature combining air temperature and relative humidity using the NWS Rothfusz equation.

Inputs

Heat Index (Feels Like)
113.1°F   45.1°C
Danger
Heat cramps or exhaustion likely, heat stroke possible

Heat Index Chart (°F)

Temp \ RH40%50%60%70%80%90%
80°F808182838486
85°F8486899397102
90°F9195100106113122
95°F99105113123134147
100°F109118129143158176
105°F121134149166187209
110°F136152171194219247

Danger Categories

< 80°FSafe
80–90°FCaution
91–103°FExtreme Caution
103–124°FDanger
≥ 125°FExtreme Danger