Nagasaki Day 2026 observed on August 9

Key facts

• Nagasaki Day is commemorated annually on August 9.
• The atomic bomb was dropped on Nagasaki, Japan, on August 9, 1945.
• The bombing of Nagasaki was the second nuclear attack in history, following the Hiroshima bombing by three days.
• The bombings of Hiroshima and Nagasaki led to Japan's surrender, ending World War II.
• The Treaty on the Non-Proliferation of Nuclear Weapons was signed in 1968.
• The Treaty on the Prohibition of Nuclear Weapons was adopted in 2017.
• The world's nuclear arsenal includes over 13,000 warheads, with Russia possessing an estimated 6,400 and the United States an estimated 5,800.