The Environment Agency is having to rescue hundreds of fish put in danger when flood waters carried them off course.
The operation is taking place at Upton Upon Severn in Worcestershire.
The fish, including bream and carp, wouldn't survive without help from the Agency and local anglers.
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Rain may be heavy in places but should clear to sunny intervals and scattered showers later in the day.
Rain quickly spreads from the west, turning heavy over the higher ground. Sheltered eastern spots will escape the worst of the rain.
Marcus Willis, a current club coach ranked 772 in the world, came through six qualification matches to reach this year's tournament.