The storm produced dangerous flash floods and mudslides, leaving six people dead and two injured.
There are six unidentified bodies.
Pemex said in a statement that some workers were still missing, but did not specify a number.
Up to 2,000 people had been reported as missing.
Earlier, the government had reported 20 dead at the Maelbeek metro station, in the heart of the European Union's capital, and 11 dead at the airport, and scores of injured.