Swimming in Thailand in september 2025 Sea temperature by city in september

In september in Thailand swimming conditions are generally the same everywhere.

In september in Bangkok, Chaweng Beach, Phuket town, Chanthaburi, Hua Hin, Khao Lak national Park, Koh Chang, Koh Lanta, Koh Phangan, Koh Phi Phi, Koh Samui, Koh Tao, Krabi - Ao Nang, Patong, Pattaya, Phuket, Koh Kut (Koh Kood), Ko Samet, Trat, Bang Kao (Laem Sor beach), Bang Rong, Bang Tao Beach, Bophut, Chalong, Choeng Mon, Chon Buri, Coral Island (Koh Hey), Kamala Beach, Karon Beach, Kata Beach, Kathu, Koh Bulon Leh, Koh Libong, Ko Lipe, Koh Madsum, Koh Mai Thon, Koh Muk (Ko Mook), Koh Phaluai, Koh Siray, Koh Sukon, Koh Taen, Koh Wai, Koh Yao Noi, Koh Yao Yai, Lamai beach, Lipa Noi, Maenam, Mai Khao Beach, Nai Yang Beach, Nathon, Panwa Beach (Khao Kad Beach), Railay beach, Rawai, Rayong, Sai Kaew Beach, Saphan Hin, Sirinat National Park, Songkhla, Ton Sai beach (Ao Nang), Cha-am, Chumphon, Nakhon Si Thammarat, Narathiwat, Pattani, Phetchaburi, Prachuap Khiri Khan, Pran Buri, Samut Songkhram, Sattahip, Satun, Si Racha and Surat Thani, swimming conditions are perfect! With water reaching a maximum of 86°F and an average of 84°F, going in the water (and staying there!) feels great.