Steam Deck performs at its best in ambient temperatures between 0° and 35° C. If the temperature gets higher than this, Steam Deck may start to throttle performance to protect itself.
Valve has issued an official warning that the Steam Deck won’t perform reliably if the mercury climbs too high.
The Steam Deck is shaped a bit like the Nintendo Switch, but it’s much larger (1.4 pounds), and the controllers aren’t detachable.
According to the official Steam Deck Twitter account, the hardware works best when ambient temperature is between 0 and 35 degrees Celsius (32 to 95 degrees Fahrenheit).