The reports release is to coincide with the COP27 conference in Egypt.
The World Meteorological Organisation says the record increase over the last eight years is fuelled by greenhouse emissions and accumulated heat.
It says the rate of sea level rise has doubled since 1993 - and in the past two years alone its increased by 10 millimetres.
The WMO, which is a UN body, says this year has taken a big tool on glaciers in the Alps, and in Greenland.
The global temperature is estimated to be 1.15 degrees above the pre-industrial age; which is the barometer for climate change.
A previous UN report said there's no credible pathway to keeping global temperature rises to within 1.5 degrees and says with current policies we are on course for a 2.8 degree rise.
That will bring more extreme weather including heatwaves, storms and flooding.
