The emergency services across Wales are braced for a busy night and thousands of people will descend on towns and cities to celebrate the start of the Christmas break.
St John Wales volunteers will help staff an alcohol treatment centre in the centre of Cardiff to deal with minor injuries in order to relieve the pressure on A&E services.
The Police are also prepared for a busy evening and will be providing a visible presence on the streets in order to minimise violence caused by alcohol.
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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.