England cricket legend Sir Ian Botham will be walking parts of the Wales Coast Path over three days in August to raise money for the NSPCC.
In recent years, he has raised money for the Noah's Ark Appeal and, last year, walked for Leukaemia & Lymphoma Research.
'Beefy's Big Welsh Walk' is part of an appeal by the children's charity, aiming to raise £3m in three years.
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The heaviest bursts are expected in the south and east, with some western areas either remaining dry or becoming dry by dawn.
Many places will start dry, but rain in the southeast will spread to most for a time overnight.
The family of Isaac Nash who went missing after being swept out to sea last summer have presented a cheque for £10,000 to the RNLI.