September International Days
September 1
- World Letter Writing Day
- International Cabernet Sauvignon Day – Thursday Before Labor Day
September 2
September 3
- World Beard Day – First Saturday in September
- International Turkey Vulture Day – First Saturday in September
- International Bacon Day (Saturday before Labor Day)
September 4
September 5
September 6
September 7
- World Duchenne Awareness Day
- Global Talent Acquisition Day – First Wednesday in September
September 8
September 9
September 10
- World Suicide Prevention Day
- World First Aid Day – Second Saturday in September
September 11
September 12
September 13
September 14
September 15
- International Day of Democracy
- International Dot Day
- World Afro Day
- World Lymphoma Awareness Day
- International Day of Listening – Third Thursday in September
September 16
- International Day for the Preservation of the Ozone Layer
- International Grenache Day – Third Friday in September
September 17
- International Country Music Day
- World Patient Safety Day
- International Eat An Apple Day – Third Saturday in September
- International Coastal Cleanup Day – Third Saturday in September
- International Red Panda Day – Third Saturday in September
September 18
September 19
September 20
September 21
September 22
September 23
- International Day of Sign Languages
- International Celebrate Bisexuality Day (also known as Bi Visibility Day)
September 24
- Heritage Day (South Africa)
- Save the Koala Day (Australia) – Last Friday in September
- International Rabbit Day – Fourth Saturday in September
September 25
- World Dream Day
- World Pharmacist Day
- International Ataxia Day
- Rosh Hoshana Begins (changes annually) – (September 25, 2022)
- World Rivers Day – Fourth Sunday in September
- International Daughters Day (4th Sunday of September)
September 26
- International Day for the Total Elimination of Nuclear Weapons
- World Contraception Day
- European Day of Languages
September 27
September 28
- World Dense Breast Day ** (Last Wednesday in September)
- International Day for Universal Access to Information
- World Rabies Day
- International Poke Day
- World School Milk Day – Last Wednesday in September
September 29
- World Heart Day
- World Maritime Day (Last Thursday of September)
September 30