Near real-time (NRT) Global SST data from VIIRS onboard S-NPP and NOAA-20 are 
produced by NOAA using the Advanced Clear-Sky Processor for Ocean (ACSPO) SST system. 

Data are provided in GHRSST Data Specification v2 (GDS2) NetCDF format, 
as L2P (swath) and L3U (gridded, 0.02deg). 

A 2-week rotated buffer is organized by Platform/Level/YYYY/DDD.

This NRT product is complemented by the VIIRS Reanalysis (RAN1) data found at 
ftp://ftp.star.nesdis.noaa.gov/pub/socd2/coastwatch/sst/ran/viirs/

Further information on the data can be found at the following links.

CoastWatch:
https://coastwatch.noaa.gov/cw/satellite-data-products/sea-surface-temperature/acspo-viirs.html

PO.DAAC:
NPP L2P http://dx.doi.org/10.5067/GHVRS-2PO26
NPP L3U http://dx.doi.org/10.5067/GHVRS-3UO26
N20 L2P http://dx.doi.org/10.5067/GHV20-2PO26
N20 L3U http://dx.doi.org/10.5067/GHV20-3UO26

NCEI:
NPP L2P https://doi.org/10.7289/V5PR7SX5
NPP L3U https://doi.org/10.7289/V5KK98S8
N20 L2P https://doi.org/10.25921/sfs7-9688
N20 L3U https://doi.org/10.25921/7c1m-rw73