Losing weight in the heat

Options
I have been dieting for months, and my losing weight slowed down until it got so hot. It was in the high eighties for a couple of weeks, and now its been 100 for a few days. I went from losing a little over a pound a week to about 3 pounds a week. Everything I looked up online says it's just water weight... I usually drink about 10 glasses of water a day, now I have been drinking about 15. SO...is anyone else losing as rapidly?