Map: Atlantic Sea Surface Temperature Anomaly, September 20, 2017
by NOAA/NWS/NCEP/EMC

Hurricane Maria re-intensified as it approached the Dominican Republic amid SSTs that were 0.5-1.25°C above average.
Source information
NOAA/NCEP real-time, global, sea surface temperature (RTG_SST_HR) analysis homepage
September 20, 2017 SST anomaly map
Archive of all September 20, 2017 high resolution data