No bodytemperature?

1333196 said:

This is an outdoor watch and i need to see it to avoid hypotermia.

Instead of depending on a watch to avoid hypothermia, you can look for symptoms that don't require a watch like 99.9% of the population.    Here's a few and you can find more online.

• Shivering.
• Exhaustion or feeling very tired.
• Confusion.
• Fumbling hands.
• Memory loss.
• Slurred speech.
• Drowsiness.

Recording skin temperature presents extensive difficulties. Although it is not a clear indicator of internal body temperature, skin temperature is significant in assessing the healthy function of skin.^[2

This product claims to measure body temperature and has ANT+ and Bluetooth, so it should work with the Fenix 5 Plus: www.cosinuss.com/.../

The F5plus series is not advertised to display body temperature. No Garmin wearable is measuring body temperature out of the box, so far. At first it can't, but maybe this data field will help you:

Estimated Body Temperature Data Field | Garmin Connect IQ

In the IQ store, there is also a widget from a different developer available

But I can´t say, which of these 2 above mentioned is most accurate / close to the real value.

Or you have to buy this (€ 230): Device for continuous and accurate core body temperature monitoring - CORE

Core Body Temperature Monitor | Garmin Connect IQ

Core Body Temperature Monitor | Garmin Connect IQ

1333196 said:

This is an outdoor watch and i need to see it to avoid hypotermia.

Hypothermia results from the body's core (inner) temperature cooling below a critical level. https://www.medicinenet.com/hypothermia_extended_exposure_to_cold/article.htm

Measuring skin temperature is of little use.

The best way to avoid hypothermia is to wear clothing suitable for the conditions.