When Is National Watermelon Day. To quote mark twain, “when one has tasted watermelon, he knows what the angels eat.”. Popular during the summer, especially at cookouts and picnics, watermelon is celebrated today with national watermelon day.

National watermelon day is celebrated on august 3rd every year. Popular during the summer, especially at cookouts and picnics, watermelon is celebrated today with national watermelon day.