Template:Encyclopedia Westarctica:This month in history/September
- 04 September - Westarctica's Discord server is created by the Duke of the Gothic Mountains. (2020)
- 08 September - Travis McHenry uses the Consular Crown to crown himself Consul-General of the Achaean Territory in a coronation ceremony conducted at Marmaris Castle (pictured) in Southern Turkey. (2001)
- 08 September - Westarctica's citizens and government officials participate in the global Rise for Climate rally. (2018)
- 10 September - Westarctica Quarterly enters active publication again. (2021)
- 12 September - Grand Duke Travis, King Timothy of Shiloh, and King Christopher of Vikesland meet in Anaheim, California for the Summit of the Three Kings. (2012)
- 17 September - The Grand Ducal Court is created. (2019)
- 21 September - The Charter of Westarctica is decreed, bringing an end to the Transitional Government. (2012)
- 24 September - Hostilities caused by the Siple War are ended when Grand Duke Niels of Flandrensis and Grand Duke Travis sign the West-Antarctic Treaty. (2010)
- 25 September - The Consular-Consort is appointed. (2003)
- 28 September - The Baron of Bastanchury is appointed Commissioner of the Treasury to handle printing Westarctica's ice marks. (2018)