average temperatures in bangkok
Bangkok: Annual Weather Averages. April is the hottest month in Bangkok with an average temperature of 31Â°C (87Â°F) and the coldest is December at 26Â°C (79Â°F) with the most daily sunshine hours at 9 in December. The wettest month is September with an average of 220mm of rain. The best month to swim in the sea is in April when the average sea temperature is 30Â°C (86Â°F).