In a standard, non-insulated container you will find you get some condensation form on the inside of the roof as it cools overnight. The heat escapes through the roof as the container cools and this is where your condensation will form.
The amount to condensation that forms is not a standard answer, this will vary depending on how much moisture was in the air (how humid it was) when you loaded the container, how much and how quickly it cools down overnight and how much free air is left inside your container.
If you’re storing moisture sensitive goods, papers, fabrics and textiles, artworks, or finished products ready for retail sale we recommend considering some of our condensation treatment options.
However for many customers who might be storing less sensitive goods we may recommend that condensation treatment is not necessary.