Taking into account the local weather in Hai Lang is an important factor for planning your visit, especially if you plan to spend your trip poolside. The hottest months are usually June and May with an average temp of 84°F, while the coldest months are January and December with an average of 72°F. The rainiest months in Hai Lang are October, November, September, and December, with each month seeing an average of 19 inches of rainfall.