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The temperature reading from my Forerunner 935 is near useless if it's worn on the wrist.
https://connect.garmin.com/modern/activity/4449915315
2.2 deg C that day for parkrun, watch tells me it was between 15 deg C and 11 deg C. It is heavily influenced by body temperature.
At least with a Tempe you might be able to mount it somewhere insulated from body heat.
Greenbank
edscoble
Sometime it get sorted in a pocket, close to body, etc. That could give incorrect temperature reading.