The WMO provisional State of the Global Climate report confirms that 2023 is set to be the warmest year on record. Data until the end of October shows that the year was about 1.40 degrees Celsius (with a margin of uncertainty of ±0.12°C )above the pre-industrial 1850-1900 baseline. The difference between 2023 and 2016 and 2020 - which were previously ranked as the warmest years - is such that the final two months are very unlikely to affect the ranking.
The past nine years, 2015 to 2023, were the warmest on record. The warming El Niño event, which emerged during the Northern Hemisphere spring of 2023 and developed rapidly during summer, is likely to further fuel the heat in 2024 because El Niño typically has the greatest impact on global temperatures after it peaks.