London Weather in May

May weather in London

May feels mild, with daytime highs around 17°C and cooler evenings near 7°C. Rain falls on about 11 days, so showers can interrupt a walk, but they rarely define the whole day. Hyde Park and the South Bank are pleasant for wandering when skies are clear; keep indoor stops like the British Museum in mind for wet spells. Long daylight gives you more time to explore, though cloudy skies are common.

For couples who enjoy city walks, May brings comfortable sightseeing without summer heat.

Flowers and bank holidays

The RHS Chelsea Flower Show is a major May event, drawing garden fans to Chelsea. It can make nearby streets and hotels busier, so check event dates before choosing that area. May also has bank holidays and a school half-term, when popular sights and family attractions can feel crowded. The exact dates vary each year.

A practical London tip: on a Chelsea Flower Show day, use Sloane Square station for the showground, but expect it to be busy. If you're heading elsewhere, avoid changing trains there around the event's opening and closing times.

Crowds and costs

May is busier than the quieter winter months, especially during half-term and the bank holidays. It's usually less crowded than the peak summer period, though Chelsea Flower Show week can push up demand for rooms nearby. June is also a popular month, with warmer days and the same amount of rain as May. For a calmer visit, choose weekdays outside school breaks and stay away from the Chelsea show area during the event.