Passengers had been earlier advised to check flight schedules amid a number of cancelations by carriers but management have now made a decision to close the Airport from 6pm on Thursday until 5am Saturday morning.
They said anyone scheduled to fly out on Saturday should check their website for updates.
Shannon also today handled a United Airlines flight diversion (UA2740) from Brussels which was due to land in Dublin but landed safely at Shannon Airport at 10.16am.
Sixty easyJet flights to and from Bristol airport have been cancelled as severe weather moves southwest, grounding around 10,000 passengers - many of them at overseas airports.
Chris Woodroofe, chief operating officer at London Gatwick Airport, commented, "Achievements like this only happen because of the collective efforts and dedication that people working at the airport - not just Gatwick staff - put in 24 hours a day, every day".More news: Lamar Jackson is a quarterback, period
The airport tweeted from its official Twitter page this afternoon.
However, bosses have announced that the final departure today will be at 20:50. We will be snow clearing throughout.
"We apologise for the inconvenience that the adverse weather has caused to passengers".
"We strongly advise all passengers due to travel today continue to check their flight status by using Flight Tracker and avoid travelling to the airport if your flight is cancelled".
A statement read: "Today remains challenging and there will be disruption".