You can use the Raster to NetCDF, Feature to NetCDF, and Table to NetCDF tools from the Multidimension Tools toolbox to export a raster, a feature class, and a table, respectively, to a netCDF file.
Exporting to netCDF data using geoprocessing tools
ArcGIS Desktop is in mature support and will be retired March 1, 2026. There are no plans for future releases of ArcGIS Desktop, and it is recommended that you migrate to ArcGIS Pro. See Migrate from ArcMap to ArcGIS Pro for more information.