Map: Atlantic Sea Surface Temperature Anomaly, September 19, 2017
by NOAA/NWS/NCEP/EMC
As it approached Puerto Rico, Maria was aided by SSTs 0.9-1.8°F (0.5-1°C) above average relative to a 1961-1990 baseline.
Source information
NOAA/NCEP real-time, global, sea surface temperature (RTG_SST_HR) analysis homepage
September 19, 2017 SST anomaly map
Archive of all September 19, 2017 high resolution data