I use the Weather Underground app after using the site (and the mobile page) for years. There is a way to subscribe to Weather Underground (through the site) and then use that account to log into the app to make it ad free. Not a huge endorsement since that process was not easy (at least for me), and previously the app was very buggy, though it had been stable for me since.
Shows the temp, etc in the notification bar, and you can set it to give you weather notifications specific to certain activities (good day for sailing?).
