It was supposed to rain today.
It is supposed to be sunny
She is supposed to be the best poodle breeder in town.
You are not supposed to smoke in here.
Those are all ok.
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The pattern is
'supposed' + infinitive.
It doesn't matter if the infinitive is 'to rain', 'to smoke' or 'to be'.
Make a sentence without 'supposed to'. Then change it so that you have 'supposed' and the infinitive of the main verb of the original sentence.
'rains' becomes 'to rain';
'smoke' becomes 'to smoke';
'is' becomes 'to be';
'are' beco