It was hot in Poza Rica because a north wind is coming through with a low pressure system coming from that storm that is sweeping across the USA.
If you are still on the coast, head inland at Guiterrez Zamora and get to Oaxaca via Tehuacan. Much better ride, much better scenery and get a cimita sandwich in Tehuacan. Weather will be up and down until Sunday.
Be real careful if you are planning on coming through Veracruz or using the route via Tierra Blanca.