I've also noticed the date in the weather itself not the watch is one day behind always showing yesterday's date but today's weather. The icon is also incorrect when you enter the weather app as well as on the weather clock.
I have tried resetting the watch to no effect.
I am using a Note 9 phone. Watch worked fine until a couple of weeks ago. Watch is stock not rooted.
I love my gear 2 due to camera and ir blaster so any tips to fix it would be so appreciated. Note incorrect icon on pic below. Snow icon at 79 F