GISS was especially notable, breaking the old record (2015) by a whopping 0.09°C.
According to GISS, the northern hemisphere had its warmest June in the records, at 1.17°C above the 1951-1980 baseline. That was a record by 0.08°C. That's 1.47°C above a baseline of 1880-1909. 2.64°F. Starting to seem warm....
The southern hemisphere saw only the 6th highest June.
Land-only was also a record high, at 1.07°C above the baseline.
These are notable temperatures, given how small the recent El Nino was compared to 2015-16. (The recent El Nino is now over.)
NOAA announces their GMST