For Europeans, the weather in Thailand feels very hot as soon as you are not near the sea. Sweating is part of everyday life in cities like Bangkok or Pattaya. Near the beach, for example on Patong beach or on the beach in Koh Samui, it is "pleasantly hot" as long as you are in the shade. In the big cities only air conditioners help, they are quite normal in every shop, kiosk and restaurant. [Note: A hotel room without air conditioning is rare and also not advisable]. You never hear complaints about the weather. The most annoying thing can be many rainy days in a row. Even when it rains, it is still pleasantly warm. You really only need long clothes in Thailand for the north, such as Chiang Mai, especially in the evening, and in the rest of the country mostly only because the air-conditioning in buses and shopping centres is set far too cold.