trulycompass.com
Heat Index Today
Live feels-like temperature, humidity, UV index, wind, and sun-angle heat risk for your location.
Current Heat Risk
Detecting
Waiting for location…
Feels Like
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Temperature
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Humidity
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UV Index
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Allow location or use detected city data to calculate local heat risk.
Outdoor Planning
Solar Load
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Sun Altitude
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Wind
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Heat Safety
Heat risk is more than temperature.
Humidity, direct sunlight, UV index, and low wind can make outdoor heat feel much stronger. Use this page before running, hiking, commuting, or working outside during hot weather.
What is the heat index today?
The heat index is the feels-like temperature when air temperature and humidity are combined. This page calculates it for your detected location and adds sun position, UV, and wind for outdoor heat risk.
Is heat index the same as temperature?
No. Temperature is the measured air temperature. Heat index estimates how hot it feels to the human body, especially when humidity slows sweat evaporation.
How does the Sun affect heat risk?
A high solar altitude means stronger direct sunlight. The same temperature can feel more dangerous in strong midday sun than in shade or after sunset.
What is a dangerous heat index?
Heat risk increases quickly above about 32°C feels-like temperature, especially with high humidity, high UV, low wind, children, older adults, or intense outdoor work.