The Most Reverend George Stack, Archbishop of Cardiff released this statement:
I share the surprise of people all over the world at the news of the resignation of Pope Benedict XVI from the Petrine Office. I am sure that many will recognise it to be a decision of great courage and humility, made with characteristic clarity of mind and action.
I ask people of faith both within the Catholic Church and outside it to keep Pope Benedict in their prayers. Although physical frailty has caused him to make this decision, his spiritual strength continues to witness to his faith and in the Lord Jesus whom he has served so faithfully throughout his life.
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More than a thousand riders will be taking part in a series of events in and around the town.
Some warm spells of sunshine will develop, although scattered heavy and thundery showers are also expected during the afternoon.
A yellow 'be aware' warning has been issued by the Met Office for much of Wales.