London in May: what to expect

May is when London stops feeling like a gamble. Daytime highs sit around 16–18 °C, nights around 8–10 °C, and the light stretches from roughly 05:30 to 21:00 by the end of the month — enough for an evening walk along the South Bank after dinner.

Rain does not disappear. Expect showers rather than a washed-out day, so a compact umbrella and a light waterproof layer cover almost everything. The bigger variable is wind: a cool north-easterly can make a Thames boat trip feel like March, while a sunny afternoon in a park feels like June.

UV is still modest, so sunburn is rarely the issue; tired feet and sudden temperature swings between a warm street and an air-conditioned museum are. Check the forecast each morning rather than packing for a whole week at once.

May is medium season in London: busier than February or November, quieter than July and August. The month has two long weekends — the early May bank holiday and the spring bank holiday at the end — and both push hotel rates up and fill trains out of the city. If your dates are flexible, the middle two weeks are the sweet spot.

Book accommodation four to eight weeks ahead for bank-holiday weekends; mid-month you can often leave it later. Theatre tickets and popular attractions such as the Tower of London and the London Eye sell out on Saturdays and holiday weekends, so reserve timed slots in advance. Weekday mornings are the quietest window at the big sights.

Transport is normal apart from the holiday Mondays, when some lines run reduced services and engineering works close sections of the rail network. Check before you plan a day trip.

May is a strong month for events in London. The two bank holidays anchor the calendar, and the longer evenings bring outdoor markets, open-air cinema and garden openings back to life.

The Chelsea Flower Show, usually held in the second half of May, is the biggest horticultural event in the country and draws large crowds to west London; tickets must be bought in advance. The RHS Chelsea Flower Show dates move each year, so confirm them before booking.

Other fixtures include the London Craft Beer Festival and various food markets, plus the regular weekend markets at Borough, Columbia Road and Portobello. Football finishes: the Premier League season ends in May, and Wembley hosts the FA Cup Final, which fills trains and pubs on the day. Check exact 2027 dates closer to the time.

May rewards being outside. The royal parks — Hyde Park, Regent's Park, St James's Park — are at their best, with roses and bedding displays coming into flower. Kew Gardens and the Chelsea Physic Garden are worth the trip west, especially if you are in town for the flower show.

For a first visit, use the long daylight to spread the big sights across the day: Tower of London in the morning, a Thames clipper to Greenwich in the afternoon, and an evening walk over the Millennium Bridge. The South Bank, Borough Market and the Southwark riverside are livelier in May than in winter because the outdoor seating is open.

Day trips work well: Hampton Court, Windsor, Oxford and Cambridge are all easy by train, and the longer days mean you can return after dark without losing the evening. If you want a bigger trip, plan your trip to United Kingdom covers how to combine London with Edinburgh, York or Bath.

Pack for two seasons in one day. A light waterproof jacket with a hood beats an umbrella on windy days, and a compact umbrella is still useful. Bring layers you can remove: a T-shirt, a light jumper and a jacket cover most May days.

Comfortable walking shoes matter more than anything else — London is a walking city and cobbles plus rain are unforgiving. Add sunglasses and sunscreen for the occasional bright afternoon, and a small day bag that fits under a coat when it rains.

If you plan to visit churches, the Tower of London or formal restaurants, one smart-casual outfit is enough; London dress codes are relaxed. A reusable water bottle saves money and there are refill points across the transport network.

April is cooler and wetter, with Easter holidays filling the sights; May is the better bet if you want reliable outdoor time. June brings the longest days of the year and slightly warmer weather, but crowds and prices climb as the school-holiday season approaches.

July is hotter and busier, with peak prices and occasional heat waves above 30 °C — uncomfortable on the older Tube lines. If you want May's mild weather with fewer people, late April or early June are the closest matches.