On 5 September 2019, Maradona was unveiled as the new head coach of Gimnasia de La Plata, signing a contract until the end of the season. After two months in charge, he left the club on 19 November.
The UK Parliament passed the European Union (Withdrawal) (No. 2) Act 2019, which received Royal Assent on 9 September 2019, obliging the Prime Minister to seek a third extension if no agreement has been reached at the next European Council meeting in October 2019.
The third debate was held in Houston on September 12. In his opening statement, Yang promised to "give a Freedom Dividend of $1000 a month for an entire year to 10 American families". During the debate, he addressed topics including healthcare, immigration, foreign relations, the War on Terror, corporate lobbying, and education and charter schools. Yang spoke for a total of 7 minutes 54 seconds, which was again the least time of any candidate.
The latest version is iOS 13, released on September 19, 2019. It is available for iPhone 6S and later, and the seventh-generation iPod Touch. Alongside iOS 13, Apple debuted iPadOS 13 at its annual WWDC keynote on June 4, 2019. It was released on September 24, 2019. iPadOS is available on iPad Air 2 and later, iPad fifth-generation and later, iPad mini 4 and later and all versions of the iPad Pro.
On 24 September, Ardern became the first female head of government to attend the United Nations General Assembly meeting with her infant present. Her address to the General Assembly on 27 September praised the United Nations for its multilateralism, expressed support for the world's youth, and called for immediate attention to the effects and causes of climate change, for the equality of women, and for kindness as the basis for action.
After the whistleblower complaint became known in September 2019, House speaker Nancy Pelosi initiated a formal impeachment inquiry on September 24. The Trump administration subsequently released a memorandum of the July 25 phone call, confirming that after Zelensky mentioned purchasing American anti-tank missiles, Trump asked Zelensky to investigate and to discuss these matters with Trump's personal attorney Rudy Giuliani and Attorney General William Barr. According to the testimony of multiple administration officials and former officials, the events were part of a broader effort to further Trump's personal interests by giving him an advantage in the upcoming presidential election.
The OnePlus 7T was officially presented in New Delhi on September 26 of 2019 and was available to order on September 28, followed by the 7T Pro unveiled 2 weeks later. The OnePlus 7T is the successor to the 7 that was released 5 months prior for the European and Asian market, and to the 6T for the American market where the OnePlus 7 wasn't available for sale. It features a new form-factor compared to its predecessors, with a 20/9 aspect ratio instead of 19.5/9. This allowed for OnePlus to make the phone ever so slightly taller than the older 6T and 7 while keeping the same width. OnePlus also decided to include the 90Hz Fluid AMOLED display found on the previous OnePlus 7 Pro. While OnePlus did keep the resolution at 2400×1080 pixels, the screen was one of its primary selling points. While the OnePlus 7T is considered a significant upgrade compared to the 7, the 7T Pro is a very subtle upgrade over the 7 Pro. It features the same display, same body, same camera system; the main changes being faster charging, faster processor and a slightly quieter pop-up camera.
On September 30, 2019, after weeks of speculation, The Rock announced that he would be making an appearance on SmackDown's 20th Anniversary on October 4, marking his first appearance on SmackDown since October 2014 and his first televised appearance since April 2016.