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I have a Raspberry Pi 3 Model B. I installed Ubuntu MATE but decided to go back to Raspbian as Ubuntu MATE was very slow. But during the short lived time I had with Ubuntu MATE, the processor's temperature go up, so now I am worried, how hot is too hot?

The CPU is pretty hot when doing tasks like apt-get upgrade, and when I run /opt/vc/bin/vcgencmd measure_temp, temperatures are hovering in the mid 40's to low 50's in °C, which is more than 100°F. Is that not normal?

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Those temperatures may be a little high for the kinds of loads you're describing, although, from experience, my Pi 3 begins to thermal throttle at 80 degrees Celsius and rarely (if ever) exceeds 85 degrees Celsius. It's easy to worry about the temperature of the SoC and under heavy loads you can expect to burn your finger upon touching it, it's normal.

Is your Pi encased in an enclosure, or do you use a heatsink?

tl;dr Don't worry.

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The maximum operating temperature of the Raspberry Pi is 85°C so 40-50°C is probably OK.

Raspbian shows a thermometer in the corner of the screen when the Raspberry Pi reaches 80°C which slowly fills up until the Raspberry Pi reaches 85°C.

  • Hello. Nice answer but can you add any sources for the 85°C figure you quoted? – Roger Jones Mar 14 at 11:32

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