1 The mean annual temperature in Dhaka, Bangladesh is hot at 26.1 degrees Celsius (79 degrees Fahrenheit). 2  The variation of mean monthly temperatures is 9 C (16.2 F) which is a very low range.3  There is a variation/ range of mean daily temperatures of 8.9 C (16.1 F).haka Average Temperatures Chart. The average temperature charts use a fixed scale so that you can easily compare temperatures between two or more locations. Simply line up the charts in separate tabs in your browser and toggle between tabs to visualise the differences.