I use an Apple Watch series 3 near the coast in Ecuador (30 degrees celsius year round). Battery has been fine for me. I wear it at night for sleep tracking,

I use an Apple Watch series 3 near the coast in Ecuador (30 degrees celsius year round). Battery has been fine for me. I wear it at night for sleep tracking, and charge it when I shower. Even on days when I shower once, I usually manage to get through the day without issue.