What is the weather really like?
September is the more reliable of the two months, with highs around 19-20C, occasional rain but plenty of dry, mild days, and daylight lasting until around 7:30pm early in the month. October is cooler, averaging around 15C, wetter, and daylight shrinks fast — by the end of the month sunset is before 5pm because clocks go back an hour on the last Sunday of October, when British Summer Time ends. Bring a proper waterproof jacket rather than an umbrella, since London rain tends to come with wind. Layers work better than a single heavy coat, since afternoons can still feel mild even on a cool morning.
Do crowds and prices actually drop?
Yes, noticeably. Hotel rates typically fall from their August peak, and popular sights that had 45-minute queues in summer often move quickly by mid-September. A genuinely counter-intuitive tip: late September beats May for museum crowds, because the summer school holidays are over everywhere in Europe but the weather is still good enough to be outside, so indoor attractions are quieter than most people assume. The exception is late October half-term, roughly the last week of the month, when British families travel and queues briefly return to summer-like levels at family attractions.
What's on in September and October 2026?
Open House London runs in September, giving free public access to buildings normally closed to visitors, from private members' clubs to modern office towers — genuinely one of the best free things London does all year, and worth planning a whole day around. The London Design Festival also runs in September across multiple venues. October brings Frieze London, the contemporary art fair that pulls galleries and collectors into town, plus events around it worth watching for free. Totally Thames runs through September with river-themed events and installations along the Thames. By the very start of November, fireworks displays for Bonfire Night start appearing on listings, worth checking if your trip runs into early November.
Keep it handy while in London
- Add it to your home screen: works offline too
- Save your favourite spots
- Turn on Congestion Charge & ULEZ alerts (free)
Where to go for London's autumn colour
Hampstead Heath turns properly golden through October and stays far less crowded than the big royal parks, with good views over the city from Parliament Hill. Kew Gardens runs its autumn colour well into October, and the Japanese maples and the arboretum are worth the entry fee, typically around £20-24 depending on the date. Richmond Park is the standout in autumn for the deer rut, which runs roughly through September and into October — keep a genuine distance, at least 50 metres, since the stags are aggressive during rutting season. All three are easy half-day trips from central London by Tube or overground rail.
Our honest take
September is the stronger of the two months if the weather matters to you; October suits anyone prioritising lower prices and quieter museums over guaranteed sunshine, as long as you pack for rain and shorter days. Either month beats summer for value and comfort, and we'd pick late September over August every time we're asked.