iOS cpu/gpu/battery temperature readings

I'm interested in if there is any way to query CPU/GPU/Battery temperature values on recent iOS systems?

There’s no supported way to get that sort of info on iOS.

What would you do with this info if you had it?

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Quinn “The Eskimo!” @ Developer Technical Support @ Apple
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It may be useful in automotive testing to check cpu temperature at a certain point in time or calculate and compare average within subsequent runs. I assume that the temperature is a direct consequence of the increased cpu load.

Not exclusively. The GPU and the cellular modem are also major power drains that vary significantly with usage.

If you want to measure CPU load for profiling purposes, the go-to tool is Instruments. If you want an API that you can use in production, check out MetricKit. If you want to build your own tooling for use during testing, there are lower-level APIs available [1]. Check out <mach/host_info.h>, <mach/task_info.h>, and <mach/thread_info.h>.

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Quinn “The Eskimo!” @ Developer Technical Support @ Apple
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[1] The nature of these low-level APIs means that I’m reticent to recommend them for deploying in a production app.

I’m interested in the same thing, because I want to make an app that shows cpu temperature and other cpu and system measurements.

Maybe not exactly what you are looking for, but might be helpful: https://developer.apple.com/documentation/foundation/nsprocessinfo/1417480-thermalstate