Sydney’s skies have cleared into a sunny winter’s day after being swallowed by fog earlier on Saturday morning, which left the Harbour Bridge and Sydney Opera House almost invisible.

The fog caused delays and diversions at Sydney Airport for a handful of flights. The airport was notified at 6am by Airservices Australia that it would need to begin low visibility procedures, which is when the arrival rate of flights is reduced.

This caused delays and diversions for some flights and travellers were asked to check in with their airlines for updates. Normal operations resumed at the airport by 9am.

Weatherzone meteorologist Aline Ribeiro said a high-pressure system, mixed with low temperatures and light winds was behind the fog, which lifted by mid-morning.

The city is expected to experience a top of 22 degrees amid partly cloudy skies on Saturday.

Ribeiro said the fog cloud will return overnight and could cover the western suburbs and the city on Sunday morning as well. Fog was very common at this time of year with cooler temperatures and light winds, Ribeiro said.

While it might be a bit odd to see the city skyline covered by a grey cloud, spare a thought for an area of the Atlantic Ocean called Grand Banks. It’s the foggiest place in the world with more than 200 days of grey cloud each year.

The Bureau of Meteorology issued a road warning for motorists as the fog made driving dangerous in all Sydney suburbs. The bureau advised drivers to take extreme care.