| 99631 | September 1 | Death | 2013 – Ken Wallis, English commander and pilot (b. 1916) |
| 99632 | September 1 | Death | 2014 – Ahmed Abdi Godane, Somali militant leader (b. 1977) |
| 99633 | September 1 | Death | 2014 – Mark Gil, Filipino actor (b. 1961) |
| 99634 | September 1 | Death | 2014 – Gottfried John, German actor (b. 1942) |
| 99635 | September 1 | Death | 2014 – Rogers McKee, American baseball player (b. 1926) |
| 99636 | September 1 | Death | 2014 – Maya Rao, Indian dancer and choreographer (b. 1928) |
| 99637 | September 1 | Death | 2014 – Joseph Shivers, American chemist and academic, developed spandex (b. 1920) |
| 99638 | September 1 | Death | 2014 – Elena Varzi, Italian actress (b. 1926) |
| 99639 | September 1 | Death | 2015 – Gurgen Dalibaltayan, Armenian general (b. 1926) |
| 99640 | September 1 | Death | 2015 – Dean Jones, American actor and singer (b. 1931) |
| 99641 | September 1 | Death | 2015 – Richard G. Hewlett, American historian and author (b. 1923) |
| 99642 | September 1 | Death | 2015 – Ben Kuroki, American sergeant and pilot (b. 1917) |
| 99643 | September 1 | Death | 2015 – Antonio Nirta, Italian mob boss (b. 1919) |
| 99644 | September 1 | Death | 2015 – Will Provine, American biologist, historian, and academic (b. 1942) |
| 99645 | September 1 | Holiday and observance | Anniversary of the Start of the Armed Struggle (Eritrea) |
| 99646 | September 1 | Holiday and observance | Beginning of Amerindian Heritage Month (Guyana) |
| 99647 | September 1 | Holiday and observance | Christian feast day:GilesThe beginning of the new liturgical year (Eastern Orthodox Church and the Eastern Catholic Church)September 1 (Eastern Orthodox liturgics) |
| 99648 | September 1 | Holiday and observance | Constitution Day (Slovakia) |
| 99649 | September 1 | Holiday and observance | Disaster Prevention Day (Japan) |
| 99650 | September 1 | Holiday and observance | Earliest day on which Father's Day can fall, while September 7 is the latest celebrated on the first Sunday in September. (Australia, Fiji, New Zealand, Papua New Guinea) |
| 99651 | September 1 | Holiday and observance | Earliest day on which Labor Day can fall, while September 7 is the latest celebrated on the first Monday in September. (United States, Canada, Palau) |
| 99652 | September 1 | Holiday and observance | Earliest day on which Teacher's Day can fall, while September 7 is the latest celebrated on the first Friday in September. (Singapore) |
| 99653 | September 1 | Holiday and observance | First day of school in many countries in Asia, Europe and the Americas. |
| 99654 | September 1 | Holiday and observance | Flag Day (Honduras) |
| 99655 | September 1 | Holiday and observance | Independence Day, celebrates the independence of Uzbekistan from the Soviet Union in 1991. |
| 99656 | September 1 | Holiday and observance | Journalist Day (Taiwan) |
| 99657 | September 1 | Holiday and observance | Knowledge Day (Russia and Ukraine) |
| 99658 | September 1 | Holiday and observance | Random Acts of Kindness Day (International) |
| 99659 | September 1 | Holiday and observance | Wattle Day (Australia) |
| 99660 | September 2 | Event | 47 BC – Pharaoh Cleopatra VII of Egypt declares her son co-ruler as Ptolemy XV Caesarion. |