Fishing on sardis and grenada

Hey, I'm planning on making a trip down asap. I was wondering when the fish generally make a move toward the banks? I like to cast for them. It that a viable way to cat h some fish? I know it depends on weather. But I was hoping someone could give me ideas of a generally good time frame?
What are the water temps at this time?
Are all ramps accessible with the current water levels?
Any information would be greatly appreciated!!
I only have a 3 days, i would like to make the most of it!
Thanks!