What does the man mean?
A)They shouldn't change their plan
B)They'd better change their mind
C)The tennis game won't last long
D)Weather forecasts are not reliable
原文：
W: If the weather is this hot tomorrow, we may as well give up the idea of playing tennis in the afternoon.
M: o. I don't think it'll last long. The weather forcast says it will cloud-over by midafternoon
Q:What does the man mean?