London in May brings mild spring weather, long evenings, fresh greenery and a busy calendar of outdoor events. It is a particularly good month for walking, gardens and sightseeing before the main summer season. You should still expect changeable conditions, so a light waterproof layer belongs in your day bag.
Quick Answer
London in May is mild, green and well suited to walking. Heathrow’s 1991–2020 averages are about 18.4°C by day and 9.1°C at night, with roughly 46 mm of rain. For May 2027, plan around the bank holidays on 3 and 31 May and the RHS Chelsea Flower Show on 18–22 May.
Last checked: October 1, 2026. Dates and figures were verified against official sources.
Key Takeaways
- Pack light layers, comfortable walking shoes and a compact waterproof jacket because mornings can be cool even when afternoons feel warm.
- The busiest periods in May 2027 are likely to include the bank-holiday weekends around 3 and 31 May and the RHS Chelsea Flower Show from 18 to 22 May.
- May is excellent for parks and gardens, although Queen Mary’s Gardens usually reaches its strongest rose display in early June rather than May.
- Keep indoor options such as museums and galleries ready for wet spells instead of building an itinerary that depends entirely on dry weather.
London in May Weather: Temperatures, Rain and Sunshine
May weather in London is generally mild, but it can change quickly. The Met Office’s 1991–2020 Heathrow averages give a more useful picture than a simple 10°C to 18°C range.
| May climate measure | Heathrow 1991–2020 average |
|---|---|
| Average maximum | 18.37°C (about 65°F) |
| Average minimum | 9.08°C (about 48°F) |
| Monthly rainfall | 45.91 mm |
| Days with at least 1 mm of rain | 8 days |
| Monthly sunshine | 207.49 hours |
Those figures are long-term averages, not a forecast for a particular trip. A May day can move from a cool, cloudy morning to a sunny afternoon and then back to showers, so flexible clothing matters more than trying to dress for one fixed temperature.
The longer late-spring days are another advantage. You can comfortably schedule parks, riverside walks and outdoor sightseeing later in the day instead of trying to fit everything into a short winter daylight window.
What to Pack for London in May
The most useful packing strategy for London in May is layering. Bring clothes that work together so you can adjust easily between cool mornings, warmer afternoons, breezy outdoor areas and heated indoor attractions.
- Light waterproof jacket: More practical than relying only on an umbrella during passing showers.
- Light sweater or cardigan: Useful early in the morning and after sunset.
- T-shirts or breathable base layers: Comfortable when afternoon temperatures rise.
- Comfortable walking shoes: Central London sightseeing often means long stretches on foot and hard pavement.
- Compact umbrella: Easy to carry for short showers.
- Sunglasses and sun protection: Bright spring days can involve several hours outdoors.
- Portable charger: Helpful if you rely on your phone for directions, tickets, photos and transport.
- Reusable water bottle: Useful during long walks and park visits.
You normally do not need a heavy winter coat in May, but packing only summer clothes can leave you uncomfortable on a cool or wet day. Check the short-range forecast just before departure and adjust your final clothing choices to the conditions expected during your stay.
Outdoor Events and Festivals in London
May is one of London’s strongest months for outdoor events, with gardening, design and cultural programmes appearing across the city. For a 2027 trip, the major event with confirmed dates is the RHS Chelsea Flower Show.
The RHS Chelsea Flower Show runs from 18 to 22 May 2027 at Royal Hospital Chelsea. RHS members’ days are 18–19 May, while public days run from 20–22 May. The show features display gardens, horticultural exhibits, growers and expert-led gardening content.
London Craft Week is another recurring May event, bringing makers, designers, workshops, exhibitions and demonstrations to venues around the capital. The official London Craft Week site was still displaying its 2026 programme when checked on October 1, 2026, so 2027 dates had not yet been confirmed.
If a particular festival is central to your trip, build the rest of your itinerary around its confirmed dates rather than assuming an event returns on the same week every year.
Indoor Events and Exhibitions in London
London’s museums, galleries and theatres make it easy to rescue a wet May afternoon. Instead of treating indoor attractions as second choices, combine them with outdoor stops so your day still works if a shower arrives.
The British Museum is a strong option for history and archaeology, while Tate Modern focuses on modern and contemporary art. Temporary exhibitions change throughout the year, so the exact programme will depend on your travel dates.
Families can also use the Natural History Museum as a weather-proof stop. General admission is free, although some temporary exhibitions and events charge separately. The museum recommends booking a free general-admission ticket in advance to help guarantee entry.
For evening entertainment, the West End gives you a wide choice of plays and musicals. A theatre evening also pairs well with a daytime park or walking itinerary because you can make the most of daylight before moving indoors.
Tips for Navigating Crowds in London in May
London is busy throughout May, but crowds are not evenly distributed across the month. Weekends, major events, bank holidays and school breaks can create much heavier demand than an ordinary weekday.
For 2027, the England and Wales bank holidays fall on Monday 3 May and Monday 31 May. Expect popular parks, family attractions, transport hubs and central shopping areas to feel busier around those long weekends.
The RHS Chelsea Flower Show from 18 to 22 May can also increase activity around Chelsea and nearby transport routes. At the end of the month, many London schools begin half-term. For example, Camden’s 2026–27 term calendar lists half-term from 31 May to 4 June 2027, although individual schools can set different dates.
Pro Tip: Put attractions with timed entry early in your itinerary and use parks, neighborhoods and riverside walks as flexible stops that can move around them.
For major sights such as the Tower of London, Westminster and Buckingham Palace, arriving earlier in the day usually gives you more room than the middle of the afternoon. Buying required attraction tickets before your trip also removes the risk of reaching a sold-out time slot.
Best Places to See Spring Flowers in London
May is an excellent month for London gardens, although different plants peak at different times. Kew Gardens, Regent’s Park and St James’s Park give you three very different spring settings, from botanical collections to formal flower beds.
Kew Gardens
Kew is the strongest choice if plants are a major reason for your visit. Its May horticultural programme highlights seasonal planting and spring displays, while Kew’s rhododendron collection typically flowers through spring.
Because flowering dates respond to temperature and weather, the exact display varies from year to year. Allow several hours if you want to combine outdoor gardens with Kew’s glasshouses and galleries.
Regent’s Park and Queen Mary’s Gardens
Regent’s Park combines formal gardens, broad paths and open green space. Queen Mary’s Gardens contains around 8,000 roses, but the Royal Parks recommends the first two weeks of June for the strongest rose display.
That means a late-May visit may catch the garden as the rose season is developing, but May should not be described as its guaranteed peak.
St James’s Park
St James’s Park is especially convenient if you are already sightseeing around Buckingham Palace, Westminster or The Mall. Its landscaped flower beds, lake and central location make it easy to add a short spring walk without dedicating most of a day to a garden visit.
Outdoor Dining and Rooftop Bars in London
Milder May afternoons make outdoor dining much more appealing than it is in early spring. Covent Garden, Soho and the South Bank all offer clusters of restaurants, cafés and terraces that work well between nearby attractions.
For a higher viewpoint, Sky Garden combines indoor planting with wide city views. Free public Sky Garden visits are capacity-controlled, and advance booking is recommended because popular slots can fill.
The Rooftop at The Trafalgar St. James is another central option for skyline views. Rooftop opening arrangements can change with private events and weather, so it works best as a planned evening stop rather than something you assume will always accept walk-ins.
May Day and Other Public Holidays in London
London has two bank holidays in May, and they matter more to visitors than the historical meaning of May Day itself. In 2027, the Early May bank holiday is Monday 3 May and the Spring bank holiday is Monday 31 May.
Bank holidays can make parks, shopping districts and major attractions busier because many local residents also have the day off. Some businesses operate different hours, while public transport can be affected by planned engineering work.
May Day is associated with older spring traditions as well as labour movements, but there is no single citywide celebration that every visitor should expect. Treat individual parades, demonstrations, fairs and cultural events as separate events with their own schedules.
Tips for Getting Around London in May
Public transport, walking and short bike rides are usually the most practical ways to move around London in May. Mild weather also makes it easier to walk between nearby attractions instead of taking the Tube for every short journey.
You can pay as you go using a contactless bank card or Oyster on much of the London transport network. TfL’s Visitor Oyster and contactless guidance explains that both can apply daily capping. With contactless, use the same physical card or device consistently so journeys are grouped correctly.
Walking works particularly well in central areas. Westminster, St James’s Park, Trafalgar Square, Covent Garden and the South Bank can be combined into walking routes without repeatedly going underground.
Santander Cycles can also work for short rides in suitable parts of the city. If you are not comfortable riding in traffic, use parks, protected cycle routes and quieter streets rather than treating a bike as the default option everywhere.
Family-Friendly Activities in London in May
Families have a useful mix of indoor and outdoor choices in May. A flexible plan lets you use parks and outdoor attractions in good weather, then move to museums if rain arrives.
The Natural History Museum is one of the easiest family options because its permanent displays include dinosaurs, animals, minerals and other natural-history collections. General admission is free, although capacity controls mean advance booking can make entry easier.
London Zoo in Regent’s Park offers a more outdoor-focused family day, while nearby park paths and gardens give you room to slow down between activities. If you are travelling around the late-May half-term period, booking popular family attractions earlier is particularly useful.
You can also build a low-cost family day around a free museum, a picnic in one of the Royal Parks and a walking route past major landmarks. This approach reduces the number of paid attractions you need to fit into one day.
Day Trips and Excursions from London in May
May’s longer daylight makes it easier to take a full-day trip from London without returning in darkness early in the evening. Windsor, Oxford and Cambridge are among the simplest choices for visitors who want history and architecture without planning a multi-day journey.
Windsor
Windsor works well if your priority is royal history. Windsor Castle is the main attraction, while the town and Thames-side setting give you enough to fill the rest of the day without needing a complicated itinerary.
Oxford
Oxford suits travelers interested in university architecture, museums and historic streets. The compact center means you can see a substantial amount on foot after arriving by train or coach.
Cambridge
Cambridge offers another university-city experience, with historic colleges, riverside scenery and a walkable center. Pleasant May weather can make outdoor activities more enjoyable, but keep an indoor alternative ready if rain is forecast.
For any day trip, avoid building a schedule that depends on the last possible return service. Leaving some spare time makes delays, longer meals and unexpectedly interesting stops much easier to handle.
Frequently Asked Questions
What is the weather like in London in May?
London in May is usually mild, with warm afternoons mixed with cooler mornings and occasional rain. Heathrow’s 1991–2020 averages are 18.37°C for the monthly maximum and 9.08°C for the minimum, with about 45.91 mm of rain and eight days receiving at least 1 mm.
Is May a good time to visit London?
May is a strong time to visit London if you want mild weather, green parks and long days for sightseeing. The main trade-off is demand around bank-holiday weekends, major events and the late-May school half-term period, so popular attractions can still become busy.
What should I wear in London in May?
Wear light layers that you can add or remove during the day. A T-shirt or shirt, light sweater, waterproof jacket and comfortable walking shoes cover most situations, while a compact umbrella is useful for passing showers. Adjust the final list to the short-range forecast before you travel.
Is London crowded in May?
London can be busy in May, especially on weekends and around major events. In 2027, pay particular attention to the bank holidays on 3 and 31 May, the RHS Chelsea Flower Show from 18 to 22 May, and the school half-term period beginning at the end of the month in many boroughs.
Does it rain a lot in London in May?
Rain is possible in London throughout May, but the long-term Heathrow average is about 45.91 mm for the month. The same Met Office dataset records an average of eight May days with at least 1 mm of rain, so a waterproof layer is sensible without assuming that your trip will be continuously wet.
What major events are confirmed for London in May 2027?
The RHS Chelsea Flower Show is confirmed for 18 to 22 May 2027. London also has bank holidays on 3 and 31 May 2027. Other annual May events may return, but their dates should not be treated as confirmed for 2027 until organizers publish the new programme.
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Sources
- Met Office Heathrow climate averages: May temperature, rainfall, rainy-day and sunshine averages.
- Royal Horticultural Society: RHS Chelsea Flower Show 2027 dates and visitor-day schedule.
- London Craft Week: current official event programme and status of published dates.
- GOV.UK Bank Holidays: 2027 Early May and Spring bank-holiday dates for England and Wales.
- Camden Council school term dates: example London borough half-term dates for May and June 2027.
- Royal Botanic Gardens, Kew: May horticultural and seasonal garden information.
- The Royal Parks: Queen Mary’s Gardens rose collection and best bloom period.
- Natural History Museum: general admission, booking guidance and visitor information.
- Sky Garden: free public access and advance booking information.
- Transport for London: Visitor Oyster, contactless payment and fare-capping guidance.
