Peak Season (June-August)The weather is warmest in summer and it is hands down the best climate to visit London. This is also when the city hosts numerous events and you can feel the vibrant buzz of the city during these months.
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The summer is the most popular time of year for visitors to London. London weather in June kicks off the warm season, followed by the typically warmer London weather in July and August. During these months, it's the warmest and driest time of the year with temperatures ranging from 20°C to 23°C on average.
While you can see most of the main sights in London in one day or two days, for first-time visitors, I highly recommend spending at least 3-4 days in London. This should give you sufficient time to get acquainted with the city, see the main landmarks, and visit a few of the most popular tourist attractions in London.
What are the quietest days to drive? Commuting is a little quieter on Mondays in many UK cities. Sunday is often the best day to go on a sightseeing trip whilst avoiding traffic – especially if you set off earlier on before many of the shops open and the usual 'Sunday drivers' venture out.