Rossi, who is a nine-time MotoGP world champion, secured a podium on his trip to the UK, improving on a P14 finish in race one to take a P2 finish in his second outing of the afternoon.
The 44-year-old finished the second race just under four seconds behind eventual winner Mattia Drudi.
Rossi and Norris reunited
Norris posted a photo with the motorsport legend to his Instagram account on Sunday evening with Rossi still wearing his race suit.
The young Briton captioned the post "Reunited with the goat @valeyellow46", prompting a reply of "Landooooooo!!!" from the nine-time world champion.
McLaren's star driver was enjoying a weekend out of the cockpit ahead of the upcoming triple-header in Barcelona, Monaco and Imola.