Suppose that ABC is the name of a city. I have written some short sentences below.
(1a) It's usually rainy in ABC.
(1b) ABC is usually rainy.
(2a) It's rainy today.
(2b) Today is rainy.
(3a) It will be rainy on Wednesday.
(3b) Wednesday will be rainy.
(4a) It will rain in ABC soon.
(4b) ABC will rain soon.
(5a) It will rain tomorrow.
(5b) Tomorrow will rain.
My non-native English speaking friends and I know all the "a" sentences are correct. We made up the "b" examples, and we are not sure if they sound OK to native speakers.
Thank you very much for your help.