On www.abair.ie it gives the Ulster pronunciation as jin-yer and the Connemara as similar but slightly longer on both syllables making it sound more like jean-yer.
Incidentally, abair.ie is a brilliant site which synthesizes any word in either of these dialects. I have never found it to be wrong on the Ulster dialect so I'm pretty confident that it must be equally correct for Connemara.
What meal is "dinnéar"? Is this the midday meal or the evening meal? At least in American English, in the Midwest, dinner can be either a midday meal or the evening meal--it's the biggest meal of the day. That's normally the evening meal, but on some occasions the largest meal is the midday meal (Sunday dinner at Grandma's, Thanksgiving dinner, Easter dinner, etc.)