The Mountain Road is expected to remain closed until Monday following the latest weather forecast.
Ronaldsway indicates further wintery weather over higher ground in the coming days.
The DoI says it will continue to monitor conditions throughout the weekend and will reopen the route sooner if it is safe to do so.
With clear skies and light northerly winds, ground temperatures are expected to fall quickly below zero around dusk, resulting in widespread frost and ice forming on untreated surfaces that remain damp or wet from earlier rain.
There is also a possibility of a few overnight showers, potentially turning wintry in places—especially on higher ground.
Although these showers are expected to be brief with only slight accumulations, they may still contribute to the formation of additional icy patches.