Ha ha, yes you probably need to attached something to protect them from rain, wind not so much. I do love Hilo, I was there couple of times before, nice and green from the rest of big island.
The chicken pop door from my coop to the run is open 24/7. They go in before dark and out by dawn, I guess they trained themselves that way since they were chicks. I only closes the door when the temps drops below 20*F and extremely windy at night.
So I guess if they have their roost inside...