In the first episode of the new series, Siôn will be seen herding sheep and sampling beer from the Forch family distillery before visiting the home of author Cennard Davies in Treorchy, whose family has lived in the same house for 150 years.
We also meet Dafydd Francis, one of Siôn’s ex pupils, who is better known as YouTube sensation Lex Gabore.
Dafydd created his own character
Siôn said: “Meeting up with Dafydd was a real eye opener I have to say. After having a hard time at school, he decided to create this character Lex, who is totally over the top.
“Since then, he’s had a fantastic reaction from the people around him. It was so interesting to hear his stories and experiences of growing up as a homosexual person in the valleys.
Dilys, 91, speaks 'old' Rhondda
“Dilys Evans, from Blaenllechau, is also a real character. She’s 91 years old and unfortunately she doesn’t get the opportunity to speak Welsh from day to day.
“She still speaks the old dialect of the Rhondda, which is full of idioms that people would have used at the start of the last century and her accent is totally different to mine – even though she only lives down the road.”
Crashes a hen party, too
Siôn also meets with a soap opera star in Ton Pentre, steps on to the stage at the Parc and Dare Theatre and joins a group of girls on a hen party in Treorchy.
And during his journey in the series Pobol y Rhondda, Siôn is determined to challenge the negative perception of the valleys that is sometimes seen.
'Rhondda people... entertaining, interesting and tidy'
“You rarely hear about all the positive things that are going on in the Rhondda,” said Siôn.
“Some TV programmes really get under my skin. The people taking part in reality series The Valleys didn’t even come from the valleys, they all lived in Cardiff.
“The people of the Rhondda are entertaining, interesting and tidy and I’m determined to reflect this in the series.”
Pobol y Rhondda will be shown on S4C on Thursday, March 3, with English subtitles.