Heat Index vs. Humidity

The influence of humidity on the apparent temperature and the heat index. The Heat Index indicates how hot it feels when relative humidity is combined with temperature.

Heat Index vs. Humidity

The Heat Index - or the Apparent Temperature - is used to indicate how hot it feels when relative humidity is combined with temperature.

With increased humidity it feels hotter as indicated in the Heat Index table below.

Calculator

Inputs

Dry Temperature (°F)

Relative Humidity (%)

Results

Heat Index (Apparent Temperature)-- °F

Dry Temperature (°F)	Humidity 0%	Humidity 10%	Humidity 20%	Humidity 30%	Humidity 40%	Humidity 50%	Humidity 60%	Humidity 70%	Humidity 80%	Humidity 90%	Humidity 100%
70	64	65	66	67	68	69	70	70	71	71	72
75	69	70	72	73	74	75	76	77	78	79	80
80	73	75	77	78	79	81	82	85	86	88	91
85	78	80	82	84	86	88	90	93	97	102	108
90	83	85	87	90	93	96	100	106	113	122	-
95	87	90	93	96	101	107	114	124	136	-	-
100	91	95	99	104	110	120	132	144	-	-	-
105	95	100	105	113	123	135	149	-	-	-	-
110	99	105	112	123	137	150	-	-	-	-	-
115	103	111	120	135	151	-	-	-	-	-	-
120	107	116	130	148	-	-	-	-	-	-	-

Heat and Humidity Index Danger Zones

90 - 104°F: Heat cramps or heat exhaustion possible
105 - 130°F: Heat cramps or heat exhaustion likely, heatstroke possible
130°F and more: Heat stroke highly likely

Heat Index vs. Humidity | MEPKit Engineering Tools | MEPKit