One of my grammar book says "can" and "could" cannot be used in questions about deduction of future.

For instance,  the following sentences are considered incorrect by my book:

Could/Can it rain this afternoon?

Could/Can we go swimming tomorrow?

My books say if we want to raise questions about deduction of future, we should say them this way:

Is it likely to rain this afternoon?

Is it likely that we will go swimming tomorrow? /  Are we likely to go swimming tomorrow?

I admit that the ones using "likely" are better, but could it be considered "wrong" to use Could/Can?

What do you think of that? Please give me your opinion, thank you very much!