Extremely high or low fluctuation in temperature in London is very rare. The average maximum temperature in warm summers of London varies between 21°C - 24°C and low temperature range remains 11°C - 14°C. Although winters remain chilly, the temperature rarely drops down below freezing point. The average temperature during winters in London remains 8°C - 12°C.
The autumns in London are mild with pleasant evenings. Being relatively dry city in Europe, the rainfall is low throughout the year. The average annual precipitation is recorded around 583 mm. You should adjust your tour to London with cheap flights to London as per the climate conditions that suits you.