They said it was going to rain, but that is not sure, it's not sure it is going to rain.
it's not sure it is going to rain.
You have two occurrences of the impersonal pronoun 'it' in the sentence:
"It is going to rain." Here, 'it' is being used in the normal subject position in statements about time, distance, or weather.
So, when you write, it's not sure...
we come back to the issue, who or what is the 'it' that has the higher intellectual judgment to weigh up factors, reason, and express a possibility?
A dog or cat? as in "it's raining cats and dogs." and they may not feel like participating in this particular downpour, thank you very much
If man, woman, or meteorologist, why are they referred to by the inanimate pronoun instead of 'he' or 'she'?