In September, Basel commemorates significant historical events that have shaped its history. One such event is the Basler Erdbeben of 1356, which was the most severe earthquake known to have occurred in Central Europe. This catastrophic event resulted in the destruction of large parts of the city, including the Münster, marking a pivotal moment in Basel's history. More information about this event can be found at Basler Erdbeben 1356. Another notable event is the failed reunification of the city and rural cantons. On October 1st and 2nd, 1938, the people of Basel-Stadt and Basel-Landschaft voted in favor of a constitutional article for reunification, but the proposal was ultimately rejected by the Federal Assembly in 1947/48. Details about this event are available at Wiedervereinigung Basel.

The following tables present notable Basel personalities whose birth or death anniversaries fall in the current month, along with a selection of events that are upcoming or ongoing. The event list is derived from an opendata-bs dataset on events and holidays/vacation days relevant to traffic, and does not represent a complete overview of all events taking place in Basel this month.