The Coronation of King Charles III

Coronation Day has arrived and the festivities have already started off damply thanks to rain showers which moved through London last Friday. More rain is expected on the big day.

A further area of rain will move into Southwest England on Saturday morning, and then continue to move east and north throughout the day. There may be some heavy showers. Steven Keates, UK Met Office's deputy chief forecaster said that rain is expected to fall in London around noontime.

The temperatures will be slightly above or at normal levels for the first week of May.

It is predicted that the high temperature in London will be between 16-18degC. (60-64degF). This would make Saturday one of most warm coronation day in over 120 years. On June 22, 1911, temperatures were as high as 17degC (63degF).

Matthew Lehnert, Met Office's Chief Meteorologist, said that temperatures in London will be lower than normal, with 16 degrees Celsius, while in the sunnier northwestern Scotland, 20 degrees Celsius is expected.

It's possible that this will be the wettest coronation in over a century. On May 12, 1937, there were zero sunshine hours and 8 millimeters (0.32 inch) of rainfall for the coronation.

The highest rainfall chances coincide with several outdoor activities scheduled on Saturday.

Showers will likely greet the King and Queen as they make their way to Buckingham Palace.

Sunday, with the Bank Holiday celebrations still continuing, will be dry in many areas, but there are some low-end rain chances and cloudy skies. On Monday, there will be heavy rain and thunderstorms in parts of eastern, central and southern England. Parts of Scotland and northeast England are also expected to have a wet and gloomy day.

The UK Met Office said that the forecast for Monday was a mix of rain and sunshine. This rain will be followed with sunshine and scattered showers. "We expect winds to be strong to fresh with temperatures around average."

This post was contributed by CNN's Taylor Ward.