Question: When is Yom Kippur? YOU SHOULD CELEBRATE YOM KIPPUR IN THE SEVENTH MONTH ON THE TENTH DAY OF THE MONTH. Yom Kippur is on the 10th day of the 7th month (Ethanim / Tishri) usually during our months of September or October. Leviticus 16:29 And this will be a permanent regulation for you: that in the seventh month, on …