1: all the locals have umbrellas. one of those walked with him.
2: he walked along the underground railtrack/tunnel or similar.
3: he has big feet, so walking on his hands the shoes were a good protection from the rain.
4: the clouds decided to rain around him.
5: he reversed the 4th dimension, walking back in time while going to his hotel. the rain went up instead of down then and he arrived dry a year ago.
who can help me complete a top10 of the dumbest solutions for a dumb puzzle?