Are you looking for a place to store it while you are there, or are you looking for a more permanent storing solution for when you come back to the US in the future???
If it is the latter, then...In the past I have bought boards on craigslist, then sold or consigned them before I leave. I have looked into renting a cheap storage unit but you are looking at around $400 -$500 for the year. More economical to just sell the board after you have used it for 3 months. Inifinty Surf SHop in Dana Point is where I consigned my last board. Great local shop and good people. If you get shop credit then they give you 80% of what they sell it for. If you take cash, then you receive 60%. In fact I have a credit there right now form the last board I consigned there.
If you just need a place to store it while you are here, then perhaps a kind soul on here or on longboard.net will take pity on your soul
Good luck,
Andy