average temperature in cape town
1 The average temperature in Cape Town, South Africa is very mild at 16.6 degrees Celsius (61.9 degrees Fahrenheit).2  Mean monthly temperatures have a range of 9 C (16.2 F) which is a very low range.ape Town 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.