There are only so many ways to say, "Today's high temperature will be...," or "Tonight's low temperature will be..."
On a former Classical station, I occasionally heard announcers rephrase, "Today's high temperature will be 80 degrees," as "80 for the top."
I neither like nor dislike that phrasing. In a way, I don't blame the announcers. Some phrases are so shopworn that I can understand the temptation to jazz them up. Besides, "80 for the top," in the context of a weather forecast, shouldn't be difficult to understand.