The Wales team will be announced later as they attempt to right the wrongs of their first Test against South Africa.
The five-try 38-16 defeat at Kings Park in Durban has led to plenty of soul-searching within the Welsh camp, after their confidence in the build-up was destroyed by their hosts.
But there remains the chance to put matters right when the second Test takes place in Nelspruit on Saturday.
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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.