So you could potentially still see wildebeest inside the Serengeti (just not the mega-herds) but to be a normal guideline, the Masai Mara is the best place to witness the Migration in September.
October is a https://theresawudm495704.fireblogz.com/60451999/the-fact-about-serengeti-great-migration-that-no-one-is-suggesting