As per NOAA's global report for September, will September 2023 be the hotest recorded September? Note that this will close at the end of the month, but will only resolve once the results are offically posted.

https://www.ncei.noaa.gov/access/monitoring/monthly-report/

Monthly Report | National Centers for Environmental Information (NCEI)

A collection of monthly summaries recapping climate-related occurrences on both a global and national scale