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Heat Index: Temperature and Relative Humidity
Air °F |
Relative Humidity (%) |
| 0 |
5 |
10 |
15 |
20 |
25 |
30 |
35 |
40 |
45 |
50 |
55 |
60 |
65 |
70 |
75 |
80 |
85 |
90 |
95 |
100 |
| 135 |
110 |
121 |
134 |
148 |
| 130 |
108 |
117 |
127 |
139 |
151 |
| 125 |
107 |
114 |
122 |
130 |
140 |
| 120 |
105 |
110 |
116 |
122 |
130 |
139 |
148 |
| 115 |
103 |
106 |
110 |
115 |
121 |
127 |
135 |
143 |
| 114 |
102 |
105 |
109 |
113 |
119 |
125 |
132 |
140 |
| 113 |
102 |
104 |
108 |
112 |
117 |
123 |
129 |
137 |
145 |
| 112 |
101 |
104 |
107 |
111 |
115 |
121 |
127 |
134 |
142 |
| 111 |
101 |
103 |
106 |
109 |
114 |
119 |
125 |
131 |
139 |
147 |
| 110 |
100 |
102 |
105 |
108 |
112 |
117 |
122 |
129 |
136 |
143 |
| 109 |
100 |
101 |
104 |
107 |
110 |
115 |
120 |
126 |
133 |
140 |
| 108 |
99 |
101 |
103 |
105 |
109 |
113 |
118 |
124 |
130 |
137 |
144 |
| 107 |
99 |
100 |
102 |
104 |
107 |
111 |
116 |
121 |
127 |
134 |
141 |
| 106 |
98 |
99 |
101 |
103 |
106 |
109 |
114 |
119 |
124 |
130 |
137 |
145 |
| 105 |
97 |
98 |
100 |
102 |
104 |
108 |
112 |
116 |
122 |
127 |
134 |
141 |
| 104 |
97 |
97 |
99 |
100 |
103 |
106 |
110 |
114 |
119 |
124 |
131 |
137 |
145 |
| 103 |
96 |
97 |
98 |
99 |
102 |
104 |
108 |
112 |
116 |
122 |
127 |
134 |
141 |
| 102 |
96 |
96 |
97 |
98 |
100 |
103 |
106 |
110 |
114 |
119 |
124 |
130 |
137 |
144 |
| 101 |
95 |
95 |
96 |
97 |
99 |
101 |
104 |
108 |
112 |
116 |
121 |
127 |
133 |
140 |
| 100 |
94 |
94 |
95 |
96 |
98 |
100 |
102 |
106 |
109 |
114 |
118 |
124 |
130 |
136 |
143 |
| 99 |
93 |
93 |
94 |
95 |
96 |
98 |
101 |
104 |
107 |
111 |
116 |
121 |
126 |
132 |
139 |
146 |
| 98 |
92 |
92 |
93 |
94 |
95 |
97 |
99 |
102 |
105 |
109 |
113 |
117 |
123 |
128 |
134 |
141 |
| 97 |
92 |
92 |
92 |
93 |
94 |
95 |
97 |
100 |
103 |
106 |
110 |
115 |
119 |
125 |
130 |
136 |
143 |
| 96 |
91 |
91 |
91 |
92 |
93 |
94 |
96 |
98 |
101 |
104 |
108 |
112 |
116 |
121 |
126 |
132 |
138 |
145 |
| 95 |
89 |
90 |
90 |
91 |
92 |
93 |
94 |
97 |
99 |
102 |
105 |
109 |
113 |
118 |
123 |
128 |
134 |
140 |
| 94 |
88 |
89 |
89 |
90 |
90 |
92 |
93 |
95 |
97 |
100 |
103 |
106 |
110 |
114 |
119 |
124 |
129 |
135 |
141 |
| 93 |
88 |
88 |
89 |
89 |
89 |
90 |
92 |
93 |
95 |
98 |
101 |
104 |
107 |
111 |
116 |
120 |
125 |
131 |
136 |
142 |
| 92 |
87 |
87 |
88 |
88 |
88 |
89 |
90 |
92 |
94 |
96 |
99 |
101 |
105 |
108 |
112 |
116 |
121 |
126 |
131 |
137 |
143 |
| 91 |
86 |
87 |
87 |
87 |
87 |
88 |
89 |
91 |
92 |
94 |
97 |
99 |
102 |
105 |
109 |
113 |
117 |
122 |
127 |
132 |
137 |
| 90 |
85 |
85 |
86 |
86 |
86 |
87 |
88 |
89 |
91 |
93 |
95 |
97 |
100 |
103 |
106 |
110 |
113 |
118 |
122 |
127 |
132 |
| 85 |
81 |
82 |
82 |
82 |
82 |
82 |
83 |
84 |
84 |
85 |
87 |
88 |
89 |
91 |
93 |
95 |
97 |
99 |
102 |
104 |
107 |
| 80 |
77 |
78 |
78 |
78 |
79 |
79 |
79 |
80 |
80 |
80 |
81 |
81 |
82 |
82 |
83 |
84 |
84 |
85 |
86 |
86 |
87 |
Air °F |
0 |
5 |
10 |
15 |
20 |
25 |
30 |
35 |
40 |
45 |
50 |
55 |
60 |
65 |
70 |
75 |
80 |
85 |
90 |
95 |
100 |
| Relative Humidity (%) |
| Heat Index |
Possible Heat Disorder |
| 130°F or greater |
Heat stroke highly likely with continued exposure. |
| 105°F to 129°F |
Sunstroke, heat cramps, and heat exhaustion likely, and heatstroke possible. |
| 90°F to 104°F |
Sunstroke, heat cramps and heat exhaustion possible. |
| 80°F to 89°F |
Fatigue possible with prolonged exposure and physical activity. |
Heat Index: Temperature and Dewpoint
Air °F |
Dewpoint (°F) |
| 63 |
64 |
65 |
66 |
67 |
68 |
69 |
70 |
71 |
72 |
73 |
74 |
75 |
76 |
77 |
78 |
79 |
80 |
81 |
82 |
83 |
| 115 |
120 |
121 |
122 |
123 |
124 |
125 |
126 |
127 |
128 |
129 |
131 |
132 |
133 |
135 |
137 |
138 |
140 |
| 114 |
119 |
120 |
120 |
121 |
122 |
123 |
124 |
126 |
127 |
128 |
129 |
131 |
132 |
134 |
135 |
137 |
139 |
141 |
| 113 |
118 |
118 |
119 |
120 |
121 |
122 |
123 |
124 |
126 |
127 |
128 |
129 |
131 |
132 |
134 |
136 |
137 |
139 |
141 |
| 112 |
117 |
117 |
118 |
119 |
120 |
121 |
122 |
123 |
124 |
126 |
127 |
128 |
130 |
131 |
133 |
134 |
136 |
138 |
140 |
| 111 |
115 |
116 |
117 |
118 |
119 |
120 |
121 |
122 |
123 |
124 |
126 |
127 |
128 |
130 |
131 |
133 |
135 |
137 |
139 |
141 |
| 110 |
114 |
115 |
116 |
117 |
118 |
119 |
120 |
121 |
122 |
123 |
124 |
126 |
127 |
129 |
130 |
132 |
134 |
135 |
137 |
139 |
142 |
| 109 |
113 |
114 |
115 |
116 |
116 |
117 |
118 |
119 |
121 |
121 |
123 |
124 |
126 |
127 |
129 |
130 |
132 |
134 |
136 |
138 |
140 |
| 108 |
112 |
113 |
113 |
114 |
115 |
116 |
117 |
118 |
119 |
120 |
122 |
123 |
124 |
126 |
128 |
129 |
131 |
133 |
135 |
137 |
139 |
| 107 |
111 |
111 |
112 |
113 |
114 |
115 |
116 |
117 |
118 |
119 |
120 |
122 |
123 |
125 |
126 |
128 |
130 |
131 |
133 |
135 |
138 |
| 106 |
110 |
110 |
111 |
112 |
113 |
114 |
115 |
116 |
117 |
118 |
119 |
120 |
122 |
123 |
125 |
126 |
128 |
130 |
132 |
134 |
136 |
| 105 |
108 |
109 |
110 |
111 |
111 |
112 |
113 |
114 |
115 |
117 |
118 |
119 |
120 |
122 |
124 |
125 |
127 |
129 |
131 |
133 |
135 |
| 104 |
107 |
108 |
109 |
109 |
110 |
111 |
112 |
113 |
114 |
115 |
117 |
118 |
119 |
121 |
122 |
124 |
126 |
127 |
129 |
131 |
134 |
| 103 |
106 |
107 |
107 |
108 |
109 |
110 |
111 |
112 |
113 |
114 |
115 |
116 |
118 |
119 |
121 |
122 |
124 |
126 |
128 |
130 |
132 |
| 102 |
105 |
105 |
106 |
107 |
108 |
109 |
110 |
111 |
112 |
113 |
114 |
115 |
117 |
118 |
119 |
121 |
123 |
125 |
127 |
129 |
131 |
| 101 |
104 |
104 |
105 |
106 |
107 |
107 |
108 |
109 |
110 |
111 |
113 |
114 |
115 |
117 |
118 |
120 |
122 |
123 |
125 |
127 |
130 |
| 100 |
102 |
103 |
104 |
104 |
105 |
106 |
107 |
108 |
109 |
110 |
111 |
113 |
114 |
115 |
117 |
118 |
120 |
122 |
124 |
126 |
128 |
| 99 |
101 |
102 |
103 |
103 |
104 |
105 |
106 |
107 |
108 |
109 |
110 |
111 |
113 |
114 |
115 |
117 |
119 |
121 |
123 |
125 |
127 |
| 98 |
100 |
101 |
101 |
102 |
103 |
104 |
105 |
105 |
106 |
108 |
109 |
110 |
111 |
113 |
114 |
116 |
117 |
119 |
121 |
123 |
125 |
| 97 |
99 |
99 |
100 |
101 |
102 |
102 |
103 |
104 |
105 |
106 |
107 |
109 |
110 |
111 |
113 |
114 |
116 |
118 |
120 |
121 |
124 |
| 96 |
98 |
98 |
99 |
100 |
100 |
101 |
102 |
103 |
104 |
105 |
106 |
107 |
109 |
110 |
111 |
113 |
115 |
117 |
118 |
120 |
123 |
| 95 |
97 |
97 |
98 |
98 |
99 |
100 |
101 |
102 |
103 |
104 |
105 |
106 |
107 |
109 |
110 |
112 |
113 |
115 |
117 |
119 |
121 |
| 94 |
95 |
96 |
97 |
97 |
98 |
99 |
100 |
100 |
101 |
102 |
104 |
105 |
106 |
107 |
109 |
110 |
112 |
114 |
116 |
118 |
120 |
| 93 |
94 |
95 |
95 |
96 |
97 |
98 |
98 |
99 |
100 |
102 |
102 |
103 |
105 |
106 |
107 |
109 |
110 |
112 |
114 |
116 |
118 |
| 92 |
94 |
95 |
95 |
96 |
97 |
98 |
98 |
99 |
100 |
101 |
102 |
103 |
105 |
106 |
107 |
109 |
111 |
112 |
114 |
116 |
118 |
| 91 |
92 |
93 |
93 |
94 |
94 |
95 |
96 |
97 |
98 |
99 |
100 |
101 |
102 |
103 |
105 |
106 |
108 |
109 |
111 |
113 |
115 |
| 90 |
91 |
92 |
92 |
93 |
93 |
94 |
95 |
96 |
96 |
97 |
98 |
99 |
101 |
102 |
103 |
105 |
106 |
108 |
110 |
111 |
113 |
Air °F |
63 |
64 |
65 |
66 |
67 |
68 |
69 |
70 |
71 |
72 |
73 |
74 |
75 |
76 |
77 |
78 |
79 |
80 |
81 |
82 |
83 |
| Dewpoint (°F) |
|
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