friends have a walk in the river Thames

What’s on in September in London and the South West

In this article, you'll learn the following:

September - autumn’s on the horizon and it’s back to school time.

Hot or not, you can still make the most of September’s mood-boosting activities across the South Western Railway network.

Smell the roses at the RHS Garden Wisley Flower Show, ignite your inner fashionista at London Fashion Week, celebrate the Thames beneath and along the river, and much more.

Read on to discover what September’s got in store in London and the South West, and how to journey to your perfect days out with South Western Railway. Let’s dive in!

Head to a cultural festival 

Totally Thames and tower bridge
Photo credit: Wirestock via Freepik.

The big music festivals like Glastonbury and Boomtown may be done and dusted for the year. But festival season isn’t over just yet! Here’s what's going on this month.

London Design Festival

London Design Festival aims to celebrate and promote London as the design capital of the world.

Head to the capital between 13 - 21 September to see what design communities across the globe are pioneering. This unmissable celebration of design features an array of unique and diverse displays, learning sessions, and more.

London Design Festival is spread across various locations in the capital including Southwark, Shoreditch, Battersea, and Mayfair. It's totally free to attend!

Open House London

Celebrate London’s buildings, architecture and neighbourhoods at the Open House Festival, which takes place between 13 - 21 September.

Step inside some of London’s most well-known buildings and best kept secrets to discover what happens inside the architectural goldmines Londonders walk past day-to-day.

The 2023 Open House Festival programme is now live, and you can book your tickets on the website.

Totally Thames

Don’t miss out on Totally Thames - a month-long celebration of the River Thames, which takes place in September.

The month-long programme runs the 42-mile stretch of the Thames, including the stunning South Bank, just a short walk away from London Waterloo.

Soak up a whole host of events  aimed at celebrating arts, culture, river organisations and sustainability. A lot of the events are free!

If you don’t mind spending a little money, you could try a sightseeing tour to get stunning views of the city.

Embrace your inner fashionista at London Fashion Week

Runway at London Fashion Week
Photo credit: Rudy Issa via Unsplash.

London Fashion Week is just around the corner! Taking place between 18-22 September 2025, the bi-annual event showcases menswear and womenswear from top British designers.

The shows are invite-only, but that doesn’t mean you can’t immerse yourself into the fashion world while it’s on.

The main hub of activity is held at Somerset House, 180 The Strand, London, with various shows held at different locations across the British Capital. Fashion Week Online has put together a handy calendar detailing the events open to the public.

Discover stunning displays at the RHS Garden Wisley Flower Show

A man and woman admiring flowers
Photo credit: RHS Garden Wisley Flower Show.

The RHS Garden Wisley Flower Show returns on 2-7 September. There will be beautiful displays, specialist nurseries, places to shop, gardening inspiration, expert advice, and vibrant floral displays.

Wisley is the flagship garden of the RHS - which also hosts the likes of the infamous Chelsea Flower Show - and one of the UK’s most visited gardens. It attracts around one million visitors each year!

To get there, catch a train to Woking, and then a shuttle bus from there to the flower show. Buy your tickets.

Visit London and the South West’s top attractions

london eye and red cabins
Photo credit: Robson Denian Mateus via Unsplash

Summer gets super busy in the capital and around the South West, with many people out and about enjoying the sun - especially families during the school holidays.

If you’re planning a trip to see the city's top sites, September’s a great time to go, as term-time resumes. The weather should still be decent, too.

Here are some of our top picks for activities across our network.

London

London Eye - Take to the skies and bask in the unmissable panoramic views of the city on one of the world’s largest ferris wheels. Enjoy 1/3 off with SWR Rewards!

Museums - We’re lucky to have some of the best museums in the world right at our doorstep. Take a visit to the likes of Tate Britain, The National Gallery, and the Imperial War Museum.

Buckingham Palace - Go to one of London’s most famous landmarks. Some of the rooms are open to public viewing, and you can also check out the Queen’s Gallery - the palace’s main art gallery - and the palace gardens.

South Bank - London’s South Bank is truly picturesque. Take a stroll along the river Thames, wine and dine at a top restaurant, and look out for Art Deco and Brutalist buildings. While you’re there, don’t miss 1/3 Off for SEA LIFE and The London Dungeon.

Planning a London getaway? Check out this handy guide to help plan your itinerary.

The South West

windsor castle
Photo credit: Steven Brown via Unsplash

Windsor Castle - Be swept away by the beauty and history of Windsor Castle. Take a tour of the palace, and be sure not to miss the Changing the Guard ceremony!

Stonehenge - Take the train to Salisbury to see one of Britain’s earliest icons. Enjoy a tour of the mysterious stones, which tower over human heads at around four metres high or attend one of the solstice events that take place.

Hampton Court Palace - Visit the gardens, galleries, chapels and more at this iconic venue. With 60 acres of formal gardens and 750 acres of historic parkland, Hampton Court Palace is one of the greatest architectural wonders of the world. Kingston upon Thames and Surbiton stations are both nearby.

Kew Gardens - head to Kew Bridge station which is 800m from Elizabeth Gate, via Kew Bridge - please note there is no level access at Kew Bridge.

There are plenty of other sights and attractions to visit in London and the South West. Discover some of our top picks.

Don’t forget to check out SWR Rewards for money-off deals on restaurants, theatre tickets, attractions, hotel stays and more.

Mexican Independence Day

mexican flag
Photo credit: Freepik

On Mexican Independence Day, Mexicans from around the globe celebrate the anniversary of Mexico’s independence from Spain which took place on 16 September, 1810.

Each year, on the anniversary, there are celebrations across the country which traditionally include fireworks, folkloric ‘mariachi’ music, and plenty of traditional food known as ‘antojitos’.

If you fancy joining in the festivities, take a peek at our top recommendations for Mexican food in London. Chow town on tacos, fajitas and enchiladas, and wash down your food with tequila and margaritas - Salud!

Southampton International Boat Show

Boat competition at Southampton Boat Show

The Southampton International Boat Show is back with a bang this September 2025 (19-28 September) with a whole new layout. The refreshed, upgraded festival returns for 10 days of fun on the water with new attractions and exhibitors for all to enjoy. 

Marine enthusiasts or new to the show, there’s something for everyone this year at the boating event in Southampton. A non-stop line-up of water performances, boat attractions and live music are all on the agenda this year. Southampton Boat Show is one of the UK’s favourite festivals and a ‘destination of discovery’ so make sure this festival is on your radar this year.

Special offer on tickets with SWR Rewards

The Great British Beach Clean

clean the beach
Photo credit: Freepik

Want to do your bit for the environment? Hit the beach and join thousands of people across the UK taking part in the Great British Beach Clean between 19-28 September.

It’s run by the Marine Conservation Society, inspiring bands of volunteers to collect litter from across our beautiful shorelines.

Make sure you take a pair of sturdy shoes, comfortable clothing, gardening gloves and preferably a picker. Find your nearest event.

Travel with SWR

Now you’ve filled your September calendar, it’s time to plan your travel. Find cheap train tickets by travelling off-peak and enjoy further discounts with a Railcard. If you’re travelling in a group, you could benefit from GroupSave.

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