This year is likely to be among the top 10 warmest on record, according to the World Meteorological Organization.
It continues a pattern of high temperatures blamed directly on man-made climate change.
The president of the World Bank, Jim Yong Kim, told BBC News that warming could no longer be ignored.
He urged action to reduce emissions to minimise the likelihood of disasters like Typhoon Haiyan, which has claimed thousands of lives in the Philippines.
The WMO's head, Michel Jarraud, echoed his call: “The Philippines is reeling from Typhoon Haiyan... and is still struggling to recover from a typhoon one year ago.
"Although individual tropical cyclones cannot be directly attributed to climate change, higher sea levels are already making coastal populations more vulnerable to storm surges."
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