Nasa's Artemis 1 rocket – waiting to blast off on a delayed mission to the Moon – will be rolled back into its storage hangar on Monday night, the space agency said, as Florida braces for Hurricane Ian.

The move, to protect the rocket from strong winds and heavy rain forecast for the Kennedy Space Centre, will cause further setbacks for the uncrewed Moon mission, which was scheduled to launch last month and has already been pushed back three times.

"After reviewing the forecast for Ian, we will roll our Artemis I vehicle back to the Vehicle Assembly Building tonight," Nasa official Jim Free tweeted. "It was the right and necessary decision to keep our people and hardware safe."

The decision was "based on the latest weather predictions associated with Hurricane Ian, after additional data gathered overnight did not show improving expected conditions," the space agency said in a blog.

The operation to move the 98-metre rocket, which is sitting on its launch pad, is set to begin around 11:00 pm (0300 GMT) on Monday night, Nasa said.

It will be ferried along on a rolling platform moving slowly to avoid damaging the rocket with vibrations.

Hurricane Ian, which was situated as a Category 1 hurricane southwest of Cuba on Monday, is expected to strengthen as it heads toward Florida through the Gulf of Mexico.

Nasa had waited until the last minute to decide whether to shelter Artemis I in the hope of being able to schedule a take-off attempt just after the storm passed.

There will now be no opportunity for blast-off within the current launch window, which runs until October 4, and Nasa has not indicated when another launch might be attempted.

The next window runs from October 17 to 31, and again from November 12 to 27 – both with some exceptions.

The storage decision represents only the latest setback for Artemis 1, after previous launch attempts were cancelled due to the hurricane and a fuel leak.

This latest Moon mission comes 50 years after the final flight of the Apollo programme, with Artemis 1 set to show whether the Orion capsule, situated on top of the rocket, is safe to transport humans back to the Moon's surface. (AFP)