The Saints lost their second game in 72 hours after a 3-2 defeat in poor conditions in Belfield.
The Saints took had a half-time lead courtesy of Danny North's wonderful effort in the first half.
UCD responded after the break with goals from David McMillan, Ciaran Kilduff and a penalty from Greg Bolger saw the student move into a 3-1 lead.
Seán Stewart scored a late consolation for Pats but it was too little too late for Pete Mahon's men.
|9||St. Patrick's Athletic||23||23|
|10||Galway United FC||23||22|