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Parts of Donald Trump’s inauguration will be moved inside the US Capitol because of cold weather that is forecast for Washington on Monday.

It will be the first time since 1985 — when a cold snap hit Ronald Reagan’s second inauguration — that a swearing-in ceremony has been moved indoors.

The president-elect announced the revised plans in a Truth Social post on Friday, saying the inauguration address, as well as prayers and speeches, would be delivered inside the Capitol Rotunda.

“There is an Arctic blast sweeping the Country. I don’t want to see people hurt, or injured, in any way,” Trump wrote.

“It is dangerous conditions for the tens of thousands of Law Enforcement, First Responders, Police K9s and even horses, and hundreds of thousands of supporters that will be outside for many hours on the 20th.”

The National Weather Service said an “enhanced winter storm threat” was in place for Sunday afternoon and evening, and predicted about 2-4 inches of snow would fall, with a “reasonable worst case” scenario of 4-8 inches.

“Bitterly cold wind chills” were expected from Monday to Wednesday, the NWS said on Friday, as it forecast temperatures to be “well below freezing” during this period.

The agency is forecasting a high of about -5C at 11am local time on Monday, when the swearing-in ceremony is due to begin, with a wind-chill of -13C that it warned could result in hypothermia or frostbite without appropriate attire.

Trump said the Capital One Arena — with a capacity of 20,000 — will be opened on Monday for a live viewing of the ceremony, and that he would visit the venue, located about 2km from the Capitol, following his swearing-in.

Other events, including a victory rally at the arena scheduled for Sunday and inaugural balls set for Monday night, will continue as planned, the president-elect said.

Trump encouraged supporters who choose to come to “dress warmly!”