London weather: Met Office issues 60-hour snow warning for all of London The Met Office says there's a heavy chance of snow fall this weekend Updated The video will auto-play soon8Cancel Play now A 60-hour weather warning has been issued for the whole of London this weekend. If you love the snow, you'll be glad to know the Met Office's two snow and ice weather warnings are in place for the whole weekend. The first one starts at midday on Saturday and goes through until 11.59pm on Sunday. There's another warning in place straight afterwards, from midnight on Sunday to 11.59pm on the Monday.