For how many days and nights did rain fall in the Genesis account of Noah’s Ark?

In the Genesis account of Noah’s Ark, rain fell for 40 days and 40 nights. This duration appears in Genesis 7:12, after Noah, his family, and the animals had entered the Ark.

The forty-day period is not the same as the entire duration of the flood. Genesis says the waters continued to prevail over the earth for 150 days, and the narrative describes a much longer sequence before the ground became dry. Confusing these figures is one of the most common mistakes when summarizing the story.

The number 40 also has recurring symbolic importance in biblical literature. Other examples include Moses’ 40 days on Mount Sinai and Israel’s 40 years in the wilderness. In the Ark narrative, however, “40 days and 40 nights” specifically describes the rain.

Genesis gives several separate time markers, including the date Noah entered the Ark, the recession of the waters, and the eventual release of the birds. These details create a structured chronology rather than a single undifferentiated storm.