It should be possible to show weather and health metrics at the same time, e.g. current temperature and total Steps!
So far the weather licences and the weather API do not allow the information to be pulled from two sources,(Tizen and Android) but Samsung is working on this issue and it should be resolved in the very near future.
Learn Tizen to develop watch faces, probably happen faster. Your request was made to Samsung years ago… I think there’s just more pressing issues to work on
Similar problem on Tizen Studio because it can’t access sHealth API the health reports it has are different than sHealth. Also Weather API is only available in Native not WebApp in Tizen Studio.
Samsung Developer Program