The RNLI says the man and boy were were swept out to sea off Aberffraw, on the west coast of Anglesey.
The man was able to make his way back to shore, but the child is still missing.
More top news
It will be a dry evening and night with largely clear skies. The winds will remain light and it will turn rather cold in rural locations.
Adrian explores devolution, travelling back in time to a Welsh rebel stronghold.
Ahead of their gig at Cardiff Castle in 1976 Quo members told HTV Wales their ambitions for the future.