The best time to visit Haikou is between November and April or between October and May. When the weather is fine here, this is a gorgeous spot, although on hot days it may be more comfortable outside the city and on one of the island's great beaches. October to May here is the rainy season and in September especially, expect to experience very heavy rainfall. During June to September typhoons are not unusual and very strong wind affects the city approximately once every ten days during this period. The rains however, do not last for too long and despite their severity if you plan your trip well, it's unlikely the bad weather will affect your plans too much.