Well today was quite warm here where I am. But I believe it will get a lot warmer as we get into mid-July thru August. The sun is usually the hottest when it is directly overhead. Which is about 3PM during the day. When you combine the relative humidity with the heat index, I would have to say that early to mid-August is when it is going to be the warmest, in terms of summer months that is. On the other hand, if you are in the house without an A/C, I would have to say that it could be very uncomfortable during the evening hours, particularly while you are trying to get to sleep. Even if you have a fan blowing on you, it could still get somewhat sticky during the night.