To be sure of a pleasant trip to the city, let’s run through the temperatures throughout the year. Here is the yearly weather, broken down into the average temperatures of each month: Bangkok January weather: 26°C (79°F), dry season Bangkok February weather: 27.5°C (82°F), dry season Bangkok March weather: 29.1°C (84°F), dry season Bangkok April weather: 30.2°C (87°F), dry season Bangkok May weather: 29.7°C (86°F), dry season Bangkok June weather: 28.9°C (84°F), shoulder season Bangkok July weather: 28.6°C (83°F), rainy season Bangkok August weather: 28.3°C (82.5°F), rainy season Bangkok September weather: 28°C (82°F), rainy season Bangkok October weather: 27.9°C (82°F), shoulder season Bangkok November weather: 26.9°C (80°F), dry season Bangkok December weather: 25.8°C (28°F), dry season