His goal cancelled the lead Yahia Attiyat Allah gave the defending champions and earned the Cairo club a 3-2 aggregate victory after building a 2-1 first-leg lead seven days ago.
Ahly scored 27 goals in 14 matches en route to continental glory and four of them came from Egypt centre-back Abdelmonem. Defeat for Wydad ended a run of two final victories over Ahly, and they paid the penalty for concentrating on defending their fragile second-leg lead instead of seeking further goals.
Unlike Europe, away goals count double in African club competitions when sides finish level on aggregate and Wydad would have retained the trophy had they won 1-0.
Ahly pocketed a record four million dollars for winning and Marcel Koller became the first Swiss coach to win the premier African club competition.