Find Average Temperature UK. The temperature in the UK usually varies with the seasons but what is the average temperature in the UK? This page will look at the average temperature in the UK. What is the average temperature in the UK?  UK has a moderate temperature all year round it is not extremely cold or extremely hot. Average temperature in the UK fluctuate from 8.5 °C (47.3 °F) in the north to about 11 °C (51.8 °F) in the south. At the same time, the average maximum temperature in the UK is 12.4 °C, and the average minimum temperature is 5.3 °C. Which months have the highest temperature on average in UK?  The…