Above what grade is heat dangerous?

Sure! Converting those exact same thresholds into Celsius helps clarify exactly when the danger rises.

1. Environmental Heat: The Heat Index Categories (in Celsius)

The National Weather Service categories converted to Celsius show how humidity impacts how the temperature actually feels to your body.

Heat Index (Feels Like)Danger CategoryWhat Happens to the Body
27°C to 32°CCautionFatigue and muscle weakness are possible if you are exercising or working outside for a long time.
32°C to 39°CExtreme CautionHeat stroke, heat cramps, and heat exhaustion become possible for anyone, and likely for vulnerable groups.
39°C to 51°CDangerHeat cramps and heat exhaustion are likely. Heat stroke becomes a very real possibility with prolonged outdoor activity.
52°C or higherExtreme DangerHeat stroke is highly likely for anyone exposed for an extended period. This is a lethal environment.

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