暑さも今が頂上で、来週からは少し涼しくなるそうだ。
The heat is at its peak now; they say it will cool down a little from next week.
あの歌手の人気は九十年代に頂上に達した。
That singer's popularity reached its height in the nineties.
景気は今が頂上で、これから下り坂になるだろう。
The economy is at its peak now and will probably go downhill from here.