What does the man mean?

W: If the weather tomorrow is as hot as today, we may as well give up the idea of playing tennis in the afternoon.
M: Oh. I don’ t dunk it’ll last long. The weather forecast says it will cloud-over by mid-afternoon.

W: How did your interview go?
M: I couldn’t feel better about it! The questions were very fair, and I seemed to find an answer for all of them.