will be rain

[dido4]

The following sentences are going to express that we may have rain tomorrow.

Are these sentences right? If not, why? How to rewrite?

1.There will rain tomorrow.
2.It will rainstomorrow.
3.It will rain tomorrow.
4.It will be rain tomorrow.
5.It might be rain tomorrow.
6.It might have rain tomorrow.


Thank u.

[Humble]

Hi,
Only #3 is correct. You could also say
It is going to rain tomorrow (if you are sure).
It may rain tomorrow.
Cheers

[Anglika]

"There will be rain tomorrow" is also an acceptable phrase (much used by weather forecasters)