Mac notebooks comply with all temperature limits that are set in national and international safety standards. Make sure to follow the user guide instructions regarding safety and handling.

Just so you know, the sensor this uses is the CPU Proximity temperature, which is different from the CPU PECI (overall CPU temperature) and each core's individual temperatures, that are often significantly higher than the CPU Proximity. Macs Fan Control reports CPU Proximity on my Mac as 55ºC, but CPU PECI as 63ºC – Velociround Aug 14 '20. Jan 11, 2018 Use your Mac notebook where the ambient temperature is between 50° and 95° F (10° and 35° C). Don’t leave your Mac notebook in your car, because temperatures in parked cars can exceed this range. You should also use your Mac notebook where the relative humidity is between 0% and 95% (noncondensing).

Mac notebooks have sensors that detect temperature changes inside your computer. If your Mac notebook has fans, they turn on automatically to cool critical components.

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Here are some tips to manage the operating temperature:

• Make sure that you’ve installed all Mac software updates and all current firmware updates.
• Use your Mac notebook where the ambient temperature is between 50° and 95° F (10° and 35° C). Don’t leave your Mac notebook in your car, because temperatures in parked cars can exceed this range. You should also use your Mac notebook where the relative humidity is between 0% and 95% (noncondensing).
• Use your Mac notebook on a stable work surface that allows for good ventilation. Don’t use your Mac notebook in your bed, on a pillow, or under covers.
• Don’t put anything over the keyboard.
• If your Mac notebook has ventilation openings, don't put anything into them.
• Use only Apple-authorized power adapters. Take steps to avoid overheating the power adapter.

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If your Mac notebook gets warm even when it isn’t doing tasks that require intensive calculations, or if it has fans that run for a long time, use Activity Monitor to check CPU activity. Look for malfunctioning processes that can put a significant load on the CPU, and check whether Spotlight is indexing your hard drive. You might also need to reset the System Management Controller (SMC) on your MacBook.

If you use third-party apps that measure the temperature of your notebook computer, it’s important to understand that they don't measure the external case temperature. The case temperature is much lower. Never use third-party apps to diagnose possible hardware issues.

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If you have issues with your Mac notebook’s operating temperature, contact Apple. Or visit an Apple Retail Store or Apple Authorized Service Provider.