Fact-check: “It's not the heat, it's the humidity.”
Verdict: Partly True (82% confidence)
The saying captures a real and well-documented physiological mechanism: high humidity limits sweat evaporation, which is the body's main way to shed heat, making the same air temperature feel significantly hotter and more dangerous. But the full scientific picture shows both temperature and humidity matter — official sources from OSHA, NOAA, and CDC treat heat stress as multi-factorial, and very hot dry air can still be lethal. So the saying is directionally accurate but overstates humidity as…
This fact-check was conducted by SpinkillerAI, a non-partisan AI-powered accountability platform.
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