From NOAA’s June 2023 Global Climate Report:
June 2023 set a record as the warmest June for the globe in NOAA’s 174-year record. The June global surface temperature was 1.05°C (1.89°F) above the 20th-century average of 15.5°C (59.9°F). This marked the first time a June temperature exceeded 1°C above the long-term average.
By definition we don’t officially know if June 2023 was an El Niño month (hence the black bar in the graph) but it was emerging and likely will be one. More about June 2023 on my Briefed by Data site.