Go to Settings---Sounds and Notifications--Scroll Down to App Notifications, which states "allow or block notifications from individual apps". hit your problem app and shut off notification. That should do the trick!
That does not work as Accuweather does not show up in apps. Seems to be a widget. It’s becoming annoying as I’m getting constant Coronavirus notifications at all times day and night.
That many notifications would certainly be hard to deal with, Lindsey54. Do you use the Accuweather Widget normally? If not, you can remove it. (The app should be on your phone.)
Please let me know if this helps.