Consider the proposition: "It will rain tomorrow." Suppose that a proposition cannot be indeterminate, but already has a truth value. Let us also assume that no future facts exist now. So a proposition in the future tense is made true today by something other than facts. But the next day arrives, and now the sun is shining. So I think, “the proposition I expressed yesterday was false.” It seems to be made false by the fact that it is sunny. But if this is the case, it does not seem to make sense to say that the sentence, yesterday, was made true or false by something other than facts.

Does it seem defensible in any way that a proposition in the future tense is made true today by something other than facts?