Education Minister Huw Lewis has defended the slight dip in this year's top GCSE grades, saying 'it's to be expected' given the ongoing drive to make core subjects more rigorous.
The percentage of pupils achieving grades A* - C in Wales has dipped by 0.1% this year compared to 2012, while the percentage of students achieving the top grade of A* has fallen from 6.5% to 6.1%.
But the percentage of students achieving grades A* and A has remained the same as last year at 19.2% - and the overall pass rate is stable at 98.7%.
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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.