Ospreys take on Toulouse, while Scarlets are at home to Exeter.
KO for both games is at 13:35
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Outbreaks of light rain or drizzle expected around the coast and hills.
Mike and Cynthia from Ystradgynlais flew out to the German city for a weekend away.
Fine and dry at first but becoming largely cloudy with outbreaks of rain or drizzle.