**One Night Stand (1984) is an Australian independent film with a limited release and is set in Sydney during the lead up to a nuclear war. Also, the excellent New Zealand film “The Quiet Earth” doesn’t qualify as the world wasn’t wiped out by nuclear weapons, but it follows some of the same apocalyptic themes.
The period 1983-84 saw a peak in this tiny genre of filmmaking. Of the films that made an impact, three were sequels/franchises (Mad Max 2, 3 and Octopussy). Given the 80s obsession with nuclear annihilation, it still remains an oddity that this list is sp short. A quick visit to the Top 100 films of 80s shows that people were more into adventure, fun and aliens.