Often with guppies it isn't a question of whether fry are being produced, but whether they have hiding places to prevent them from being eaten by the adults or other fish.
Im confused by your response. Are you saying your lack of activity is due to the high temps and are suggesting lower temps? I couldn't tell if you were responding to me or the reply to my post.
I was saying the higher water temperatures caused my guppies and those of other breeders in my area to slow down and in most cases stop breeding. As temps start cooling here breeding will start up again. And it's not just fish. My hens don't lay nearly as regular as when temps are a bit cooler.
I will second the "hiding spots"! I've seen these fish breed in super murky waters. They are called the million fish for a reason. Give them warm water and hiding spots and they will breed http://guppy-fish.com is a descent resource to get info on