Even though the London tourist attractions are plentiful and you will have a lot to do the weather does not always play along with the plans. It is advisable to visit London during the summer months of June to August to ensure the most pleasant weather and also there are many things to do in London for all age group people.
Winters: During winter (November to February) it is often cold and rainy, with highs around 7°C. However, if you really like to enjoy the European winter and the merriment of Christmas, visit the city during December. However, you will have to pack a lot of warm clothes for your visit. You can also expect snow then! Also, this is an off season, so lesser crowds!
Spring: March to May is the spring season and a great time to explore the colours of London
Summers: In summer (June to August) however, the average temperature is a pleasant 23°C. London is at its best in summers since the city blooms with colors and sun kissed streets. The dampness that otherwise envelops the city during winters, vanishes in the summers. If you want to explore the historical side of the city and wondering when to visit London, Summer is the right time for you! Expect high prices and large crowds since this is a peak season.
Autumn: Falling between the months of September to October is the Autumn season. September and October are the wettest months and not an ideal time to visit London. It isn’t a very good idea to plan your holiday when it is so wet and dreary. Unless that is exactly what you are looking for!
So, the best time to visit London is between June to August.