The original idea behind Alien Fong's lust Like Weather was to make a film about marriage. He became intrigued with a young couple (Christine Lee and Chang Hung-nin) who had been separated three times in only five years of marriage. After shooting long interviews with them, the film's storyline gradually emerged and became as much about the topical issue of emigrating from Hong Kong as about the couple themselves.

The fictional scenes in Hong Kong are largely amplifications of real events. Fong's maior role was to settle their dispute over whether to go to the US by actually taking them there for the film.