Potential causes of car shaking at high speeds?

I drive a 2019 Honda Civic Coupe. During the snowstorm my car was stuck and I had to dig it out and rock it in order to get it out from the snow. Eventually I did. I drove yesterday to the grocery store and it drove fine. I reached 40 - 45mph.

This morning on my drive to work, I went on the highway where I drove between 65 - 80mph. The car was vibrating the entire time. The steering wheel did not shake at all. It’s just that I felt the seat shaking and could hear rattling. It seemed to happened regardless of whether I was accelerating.

Winds were strong today on the highway. My drive to work on the highway is mostly through flat fields. I felt like I was fighting the wind the entire time I was driving. My weather app says winds are 15mph with 34mph gusts. Could wind alone be the cause of the shaking?

What are some other potential causes?