Using Apple watch 6 in a Jacuzzi, Sauna 41 degrees C.

Hey,

On short term it wil not affect your Apple Watch, but on long term its not recommended.

Here is a link from the official apple website about water resistance

https://support.apple.com/en-us/HT205000

Per Apple: Water resistance isn't a permanent condition and may diminish over time. Apple Watch can't be rechecked or resealed for water resistance. The following may affect the water resistance of your Apple Watch and should be avoided:

• Dropping Apple Watch or subjecting it to other impacts.
• Exposing Apple Watch to soap or soapy water (for example, while showering or bathing). 
• Exposing Apple Watch to perfume, solvents, detergent, acids or acidic foods, insect repellent, lotions, sunscreen, oil, or hair dye. 
• Exposing Apple Watch to high-velocity water (for example, while water skiing). 
• Wearing Apple Watch in the sauna or steam room. 

As for the pressure rating, which can be confusing to those first encountering this rating system: Water-resistant (not water-proof!) to ~50m equivalent pressure rating, which is approximately shallow-water surface swimming, fishing, etc. Not diving. Suitable for everyday use, showering, bathing, shallow-water swimming, snorkeling, water related work, fishing. Splash/rain resistant. Skin diving needs the 200m rating. Moving water and jetting water—such as might arise in a jacuzzi—can produce transient higher-pressure water, hence the Apple warning on water-skiing.