The pair first travelled to The Hanging Gardens in Llanidloes, a community project focused on resilience and creativity, before going on to visit an art gallery in Newtown.
They arrived to cheers from crowds waving Welsh flags and holding bunches of daffodils, before sipping hot drinks and chatting to people making signs, baking cakes and making traditional stew in preparation for the festivities.
The royal couple later braved the wet weather for 25 minutes to speak to well-wishers and pose for selfies.
Events including parades and concerts will be held in villages and towns across Wales to celebrate St David’s Day on Sunday.
Little is known about the saint who, according to legend, was born on a clifftop in Pembrokeshire during a violent storm, after angels foretold his birth to St Patrick 30 years prior.
Some believe he lived for 100 years and died on 1 March 589, which is recognised as the Feast of St David.