I saw the boy and thought, "Bless. Adorable." And I didn't think anything like what other commenters wrote to this video where I first saw it on a British site and on American YouTube. Several comments struck me as disturbing, stereotypical and just plain mean.
A few commenters remarked on the boy's race. How odd! That never even occurred to me. Several guess his age at nine and I think that is wrong. A few others remarked the boy must be autistic. Others said ADHD. We see the behavior of an ordinary boy behaving ordinarily and his 30 seconds of observed ordinary amusing behavior is automatically diagnosed medically in a way that has boys medicated for large chunks of their childhood.
Others said the boy should be punished. For being a boy.
The weather guy is thinking about his audience in one moment and the next moment his concerns become immediately jumbled and complicated; his audience, his station, his boss, his peers, the coworker with the boy, and the boy, unpredictability, all at once jamming his usual banal weather presentation. He handled all that very well.