Police are warning people to stay away from the centre of Douglas after work.
Both the Ben-my-Chree and the Manannan are set to arrive at the Sea Terminal around 6pm.
Traffic is expected to be bad along Lord Street, South Quay, and down the Promenade.
Bad weather delayed a Liverpool to Douglas trip at 12.00pm until 3pm causing it to potentially dock at the same time as a ferry arriving from Heysham.
Gales put two ferry sailings at risk tonight
Should the Island throw a birthday party for Barry Gibb?
Warning issued over icy roads
High ground could see 4 inches of snow on Saturday night
Mountain Road unlikely to open before Monday
Yellow warning for freezing temperatures tonight
School bangers night called off
AK47 and Uzi handed in to police