Could be. Generally you won't get condensation directly on foam. Condensation forms when air is close 100% humidity and the surface is colder than the air, reducing the air temp at the surface and forcing the water out of the air. Since foam is light and insulating it will be at the same temp as the air, so little to no condensation. But that doesn't stop the water condensing on the bottom surface from running down through the foam. Or maybe condensation on the water lines themselves if they are filled with antifreeze and its been cold and you're now getting warmer wet weather.
As a test if you have access to power you could put an electric heater in there for a day or so before the next rain event to warm things up and see if that stops the dripping.