Yes, the outside outlet is getting water inside, some how.
It's common for the GFI outlets to trip in the rain if a cord in left plugged in. Water enters the end and trips the circuit.
"Don't argue with stupid people. They will just drag you down to their level, and beat you up with experience."
Patently waiting for the apocalypses to level the playing field in this physiological game of life commonly known as Civilization