My weather app on Samsung Galaxy 6 just disappeared so I tried to install a new weather up but I did not know what I was doing, now I lost my Home screens, I only get the weather app - and with ads!
Welcome to Android Central! Swipe down the notification panel, tap the Settings icon, go to Apps, find that weather app, and Uninstall.
Weather apps can be notorious for adware or worse, since that category is so popular. I like Transparent Clock & Weather, which does have some small banner ads in the menus if you just want the free version, but it won't take over your lockscreen or anything.