Auckland Transport tweeted just after 8.30am that weather had affected Gulf Harbour ferry services.
"Due to current weather conditions, all Gulf Harbour ferry services will be operated by bus until further notice," they tweeted.
Widespread disruption is expected in Auckland on Friday, when NZ Bus drivers will be taking industrial action for 24 hours. Howick & Eastern bus services will also be off the road for 24 hours in a separate dispute.