In the Genesis flood story, how many days and nights did rain fall on the earth?

In the Genesis flood story, rain fell on the earth for forty days and forty nights. Genesis 7:12 states this directly after Noah, his family, and the animals entered the ark.

The number forty has a prominent symbolic role in biblical narratives. Elsewhere in the Bible, Moses spends forty days on Mount Sinai, and the Israelites’ wilderness journey is associated with forty years. In the flood account, however, the forty days describe the period of continuous rain, not the total time Noah remained aboard the ark.

That distinction matters because Genesis also says the waters prevailed for much longer. The flood story describes the waters rising, remaining high, and then receding; the ark’s occupants therefore stayed inside beyond the forty days of rain. Genesis 8 records the later drying of the ground.

Readers sometimes confuse the forty days of rain with the entire flood duration. They are separate time spans within the narrative, and the text’s chronology includes additional waiting periods before the land became habitable.