If you do not want smart zone schedule to override your own programmed schedule, you can set up the Smart Zone level from Advanced to Basic, which only skip rainning days for your programmed schedule. This is in Settings->Zones->Smart Zone.
You can also customize the weather restrictions in setting -> preferences -> rain. By default, Netro skip schedules today and tomorrow if today rains more than 0.2 inch. You can customize it, like I want to skip the schedules on the day after tomorrow as well, or I want to skip if rain more than 0.5 inch.