Question: are you asking about a homepage for your Safari browser (I don't think it can be done) or are you asking about setting up your front screen wallpaper?
OK then, it seems like you're writing about the "wallpaper" desktop image on the top right of THIS page. The answer: this has been asked before -- no solution. Try a Google search for "time temperature app on the iPhone" or something like that, and see what gives. A bit of research does wonders.