Prince William will be a guest at the Anglesey Show where he watch gundog and falconry displays before meeting local young farmers.
Afterwards, he will view some cattle judging before moving to the central show area.
The Duke is also expected to make a short speech before being presented with a gift.
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Jingles, a bubbly four-month-old black Labrador, will undergo intensive training on the wards of Magilligan in County Londonderry.
A second band of very wet and windy weather spreads in from the west overnight and throughout Tuesday.
Police were called to the scene in Helsby in the early hours of Monday morning.