Fiji's response was a super try.Amenoni Nasilasila, who has been electric all weekend, sliced through a weak Kenya decisive line and crossed the whitewash gallantly to hand it back to his team-mate Vatemo Ravouvou who touched down the ball for a 24-5 lead.
The situation could further deteriorate with another storm system expected to pass through the country early next week.
Kenya had earlier defeated Scotland 19-12 in the cup quarters with Collins Injera scoring two tries while Willy Ambaka was also on the score sheet. Canada's Pat Kay scored first in the second half, but the missed conversion left Kenya with a two-point lead before the floodgates opened and the Africans ran in three tries to finish 33-10 winners.
"Hong Kong is always special for us", captain Jerry Tuwai said.
Commonwealth Games squad members Ethan Davies, Luke Treharne, Morgan Williams and Tom Williams featured in Hong Kong, before next weekend's fixtures in Australia.
"We were clinical and accurate in what we did", said Fiji coach Gareth Baber.
Having made the Hong Kong semis for the first time, Kenya booked their first appearance in the decider with a 21-12 win over New Zealand.
Nelson Oyoo (right) of Kenya hands off Fiji's Eroni Sau during the Cup Final of the Hong Kong Sevens.
Fiji's third match win of the 2018 Sevens Collection took the Pacific island group to inside three factors of leaders South Africa within the general standings.
South Africa beat New Zealand 29-7 to take the bronze medal, whereas Argentina edged United States of America 14-12 to safe fifth.
They will meet Fiji in the final after they beat South Africa 26-24 in a thrilling first semi.