The Steam Packet says a final decision about sailings on Tuesday will be made at 07:15 in the morning.
With heavy rain and strong winds expected, there is a possibility of disruption or cancellation.
Monday's overnight schedule has been tweaked to try and avoid the worst of the weather.
The 02:15 am sailing will now leave 45 minutes earlier at 01:30am.
Passengers need to check in no later than one o'clock.
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