This film has too much divided opinions, and the mine is "Weather Man" is a good movie with one exceptional sequence represented by the exceptional Michael Caine.
I think this is by nothing a comedy, but mostly a drama. But to appreciate this, the key is a phrase Michael Caine, much better than the protagonist Nicholas Cage, says one or twice: "You know, difficult things are a matter for adults".
Yes, this a movie for adults, but today's cinema isn't for adults, but for teenagers, and teenagers haven't lived life.
Nicholas Cage, the protagonist is a well paid speaker in Chicago TV about the weather. He's that "Weather Man" all TV stations have all around the World. He's not taken very seriously, but a frequent objective for jokes. In fact he knows he's only a decorative figure, not a real meteorologist.
This is the drama of this Weather Man, as furthermore, he has failed in his marriage, he's divorced and has a daughter mostly stupid, born in a material comfortable home, but unable for interesting or effort in nothing, in this case, sport archery. She only wants to kill animals, as she surely hasn't seen any real hunting piece.
But another time, is the father of the weather man which remember us what life is really. Michael Caine plays superbly an old Pulitzer Prize yet forgotten and has got a terminal cancer. Modern society rejects intellectuals, for that this movie has passed mostly unknown. Caine knows there's no much time for him to die, but, then , before the end, this film has a colossal sequence that for me justifies all the film, and is the conversation into the car between fateher (Caine) and the weather man, Cage, with the musical bottom of rocker Bob Seger: "Like a Rock". If you aren't moved for this scene, you are surely more dead than Caine, the father which was, and still is, like a rock in work and in life something the Weather Man is unable to be. Not a round film at all, but very good.