Something will happen at the appropriate or natural time.
While "be due" is about timing, "due to" is often used to explain the reason for something, functioning like "because of". The game was canceled due to heavy rain. be due
This is the most common use. It shows that something is planned to happen at a specific time. Subject + be + due + (to infinitive) Examples: The train is due to arrive at 6:00 PM. The report is due on Monday. Her baby is due in September. Money and Obligations Something will happen at the appropriate or natural time