Our sports reporter, Nick Hartley, has arrived at Murrayfield ahead of the Six Nations clash between Scotland and Wales.
Very wet on sides of pitch at Murrayfield. Stopped raining now but likely to very very greasy/heavy under foot. http://t.co/HYX591rHuJ
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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.