i think mornings and evenings are good..afternoons always seem to get mushy most of the time. During the time of bertha in south jersey, it would always be small during the day and then be firing in the evening at this one beach..strange
It has been said that as the sun rises in the East the wave size does increase.
I generally prefer the early morning... just after feeding time. At many places the winds start going on-shore around 10am as the land mass warms relative to the ocean temp. In other places it does not matter because the waves are tide dependent (e.g., where there are 8'+ tide swings) - just hope for cooperative winds.