Snow warnings have been issued for Northern Irish and Republic of Irish areas as a storm system approaches.
The storm system is moving through Ireland and it will likely be heavy on the UK as well.
The UK is experiencing its coldest September since the 1930s and there is a chance the snow may start to fall on Tuesday.
Snow will begin falling on Tuesday night into Wednesday, with a peak of 10cm falling by Wednesday morning.
There will be severe weather warnings across parts of the UK, Wales and Northern Ireland, and there will be a lot of people on alert.
The Met Office in the UK is predicting the strongest snow will be across the south and east of the country, with temperatures in the 20s.
The snow is likely to start falling on Monday, and be followed by heavy rain and heavy snow.
On Monday, heavy rain is forecast for parts of England, Wales, Scotland and Northern Italy.