It is the seventh month in a row to break global temperature records.
The figures for last month also broke the previous record for April by the largest margin ever recorded, meaning the monthly record has been broken by the largest margin ever for three months in a row.
It also means the past seven months have been at least 1C above the 1951-80 mean for that month.
Figures released by Nasa over the weekend show the global temperature of land and sea was 1.11C warmer in April than the average temperature for April during the period 1951-1980. This broke the previous April record set in 2010 by 0.24C.