"The Grey October Clouds go drifting by" (not the same as the Grey October one above): from Tommy Makem and Liam Clancy: see here:
https://www.youtube.com/watch?v=OLd7V_A_lNw

And not specifically October, but "Autumn Has Come" by Shay Healy, which you can find on another thread, but a YouTube here:
https://www.youtube.com/watch?v=oedHC4R3LAo