Sydney was engulfed by thick fog that covered large parts of its metro area from the western suburbs to CBD.
The poor visibility caused a wealth of delays across the port city this morning, with flights and public transport affected by the fog.
The Bureau of Meteorology warned residents to take care when driving as visibility on the roads was just about 200 metres.
Replacement buses were organised for those unable to catch ferries with services cancelled earlier this morning. However, all services are currently back up and running.
By 8:00 a.m. two dozen flights were impacted at Sydney Airport as the result of weather.
While the fog started to lift, backlogs might cause problems throughout the day for passengers flying in or out of the airport.
Low visibility in Sydney saw a cruise ship stuck in the middle of harbour, with residents complaining of hearing liners foghorns since around 5:00 a.m. this morning.
The fog is thought to have been caused by warmer than average temperatures, with the Harbour City expecting sunny day with a top of 23 degrees.