Red Funnel's hi-speed service will only be operating hourly until Tuesday, at 45 minutes past the hour from Southampton and 15 minutes from West Cowes, Isle of Wight.
The reduced service is as a result of a breach in the hull in one of its ferries, which now requires urgent repairs. The company's backup vessel is out of service due to its annual refit, Red Funnel said.
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Friday's lunch time weather for the east of the region
People embarking across the Channel should prepare for disruption due to the problems at Calais terminals and the impact of Operation Stack.
The M20 London bound carriageway has now been reopened to traffic but Operation Stack is expected to remain in place into the weekend.