Access datacubes from ArcGIS Online through OGC standards.
does not directly allow accessing 3rd party services,
however such a service can be connected into some existing ArcGIS Server instance.
In the following, the ArcGIS Online documentation is cited.
OGC WMS or WMTS layers can be added to ArcGIS Online
to maps in Map Viewer or Map Viewer Classic
to scenes in Scene Viewer,
and as items to ArcGIS.
Best follow the ESRI documentation for adding such layers.
These request URLs allow accessing the AvgTemperatureColor layer: