NEMA type 9 for Class 2 div 1 or Nema 4 for Class 2 Div 2?
Neither should have moisture penetration.
I have seen enclosures outside that will draw moisture (humidity) in as they cool at night. An option would be to use a panel pressurization system that meets Class 2 Div 1 requirements and will also keep the enclosure from wicking in moisture.
Hope this helps