Wales are narrowly in front after 40 minutes in Rome.
Leigh Halfpenny has kicked three penalties, but missed one more - with Kris Burton slotting two in reply for Italy.
Heavy rain made attacking rugby very difficult, and contributed to an error-strewn first half.
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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.