London September Outfits

Are you planning a trip to London in September and wondering what to pack? September is the ideal time to visit London with less crowds and sunny weather making it perfect for exploring the city.

A vacation to London is on many people’s travel lists, with many wonderful historical sights and exciting attractions to explore.

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September is a great time to visit, as the city is quieter, yet the early autumn weather is pleasant. However, along with its famous monuments, London is also famous for its changeable weather.

This article covers:

• September Weather and Outfits Overview
• Essential Clothing Items
• Outfit and Packing Guide
• Personal Experiences and Tips 💡 
• 5 Must-Do Activities in September

💡 Make sure to read my valuable personal experiences and tips almost at the end of this article!

For more fall tips in London, check out our other monthly guides:

• London October Packing Guide
• London in November

As a Londoner who has lived in the city for 20 years, I will guide you through what to expect from London’s weather during September, including temperature information for the entire month, rainfall estimates, and what to pack to get the most out of your city break to the capital.

We answer every question you might have about your visit during September.

The links above open in a new tab. They are incredibly useful for your London trip!

September Quick Facts

• Attractions: All attractions are open and accessible. Additionally, there are plenty of west-end theatre shows open for daytime and evening viewings
• Accommodation: Hotel prices are varied depending on your budget. There are more expensive options within central London and then more affordable options a short tube ride away
• Clothing/Outfits: Pack for nice weather but prepare for dips in temperatures. Bring t-shirts, shorts, dresses, skirts and a small jacket for the daytime, but sweaters and jeans for the evening.

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London Eye’s capsules are air-conditioned!

Tip: Do yourself a favor and get fast-track tickets, as the waiting time in the queue can be up to 45 minutes or sometimes even longer! (the tickets purchased via the widget above are also fast-track ones!)

Weather Overview

If you’re planning to visit London from mainland Europe, temperatures will feel slightly lower in September. Nevertheless, the weather can be surprising, with many days of sunshine and temperatures climbing into the double digits.

As with any month in the UK, you do need to prepare for changes in the weather. There can be sudden spells of rain and wind with temperatures dropping particularly in the evening.

In London, days can be warm during this month and cooler in the evenings. The weather is mostly pleasant with highs of around 19°C (66°F) with a chance of 15 days of rainfall. In the mornings and evenings, the temperature can dip to around 14°C.

Despite the chance of rain, London offers plenty of things to do regardless of the weather, plus most attractions will have a shop nearby to buy an umbrella should you need one!

The average high temperature can also vary depending on the time of the month you go:

• Early September: 21°C (70°F)
• Mid-September: 19°C (66°F)
• Late September: 17°C (63°F)

Weather Visitor Reports

• “September has  typically mild and sunny days with a snap of early autumn in the evenings”
• “Spent one week in London in mid-September. We had one day of misty clouds, not real rain, and the rest was mild, warm, dry, and sunny”
• “September is usually a pleasant month in London: Still warm without being stifling and with the crowds easing off for the season.”

Daily temperature progression during a day in September:

• Morning: 16°C
• Afternoon: 20°C
• Evening: 17°C

Rain

Throughout September, it is quite likely to experience rainfall at some point during your trip. It is estimated there is a 49% chance of rain during the first couple weeks of September which decreases slightly to 42% towards the end of September.

Typical rainfall in September reaches an average of 49mm, so remember to bring a waterproof jacket or umbrella and waterproof shoes.

Colder Times

No matter what time of the year you visit London, the mornings and evenings will always be cooler, and you need to be prepared for drops in temperatures. The temperature can dip between 12°C and 14°C compared to 17°C and 21°C in the daytime.

Typical daily temperature progression during a day in mid-September:

• Early Morning: 14°C
• Morning: 16°C
• Afternoon: 20°C
• Evening: 18°C

Chances of Snow

The chance of experiencing snowfall during September in London is basically zero. The last time it snowed in London during September was in the year 1885.

What to Wear and Pack | Overview

We recommend that you pack different outfits for the daytime and the evening. Layer up in the morning with a T-shirt or long-sleeve top and a jacket. Then towards the afternoon, you can usually lose the jacket and enjoy the warmer weather.

Throughout September in London t-shirts, shorts, skirts, and dresses with a light jacket will usually suffice in the daytime.

During the evenings, you will need to wear trousers, sweaters, and a thicker jacket if you are going to be outdoors and for traveling. The weather can sometimes be unpredictable in September, so be prepared for rain one day and sunshine the next!

💡 Typical London attire for September would consist of a jacket, such as a denim or leather jacket, layered over a t-shirt or dress. The style in London is quite laid back and comfortable during the day.

As visitors often walk everywhere, flat, comfortable shoes are key to navigating the city. In fall, the typical style of footwear is usually a pair of classic leather boots or trendy sneakers.

Jeans are often worn around London during the day and are often dressed up for going out at night in September. However, if the weather is set to be sunny expect Londoners to be making the most of the heat with simple dresses, and relaxed t-shirts paired with long shorts.

Packing list:

• T-shirts
• Sweaters/jumpers
• Shirts
• Light jacket
• Rainproof jacket
• Skirts/Shorts
• Jeans
• Socks
• Trainers and Sandals
• Short-sleeve dresses
• Long-sleeve dresses
• Umbrella
• Suncream
• Backpack or shoulder bag
• Hat / baseball cap
• Sunglasses
• Hand sanitiser
• Antibacterial wipes
• Tissues
• UK travel adapter (3 pin plug)

Essential Clothing Items

Jackets

During September you will need a light jacket that can be worn during the day over T-shirts when it’s cool and as an outer layer over sweaters in the evening.

As there is a high chance of rain in September, make sure your jacket is waterproof and warm enough to keep the wind away.

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Great options for light jackets to wear in London during September include:

• A denim jacket. This is a great option for early September when the weather is warm, however, it is not a waterproof option so you will need an umbrella too.
• A trench coat. A trench coat will protect you from the cool breeze and sudden rain showers. It is also a stylish jacket option that can be worn during the day and in the evening.
• A raincoat. If you are visiting in late September a warm raincoat is essential to keep you prepared for the colder temperatures and rain showers that are common later in the month.

Dresses and Skirts

For women, dresses or skirts paired with boots or trainers are ideal for exploring London and can be dressed up or down for daywear and going out in the evening.

During early September midi-dresses and skirts or tea-dresses are ideal for sunny days when the temperatures can reach 20C. You can also layer sweaters and jackets over dresses or pair them with skirts allowing you to adjust your outfits depending on the daily weather.

Trousers

London has a laid-back attitude towards fashion, with more and more people dressing for comfort.

Jeans are an essential outfit item in London as they are versatile and easy to style. Wide-leg jeans have gained popularity again however whichever style you are comfortable wearing will be accepted in London.

Darker wash jeans are more acceptable for evening wear and can be paired with trainers during the day and smart boots to go out in the evening.

Many restaurants and theaters allow people to wear jeans in London, however, it’s good to check dress codes before you go.

Chinos are another great trouser option for London as they are easy to style and look smart when paired with a shirt for going out at night.

Cargo pants are also very popular in London, especially for men, and are a common daywear option that is comfortable and warm, ideal for later in September when the weather cools down.

Shoes

September is known for its changeable weather with sunny, warm weather and rain showers sometimes on the same day.

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London is also a very walkable city with many attractions close to each other so expect to get plenty of steps in during your trip. Here are my recommendations for footwear for September.

Sandals are often worn in the first week of the month when the weather in London during September is warm.

In recent years, early September has been hot, with temperatures in the 20s (degrees Celsius), so people often wear comfortable open-toe shoes or sandals in the city.

Sneakers, or trainers as the British refer to them, are widely popular in London and offer comfort and versatility. You can choose to bring a smart pair that will work for walking around during the day and going out at night, or choose a brightly coloured pair to showcase your personality.

Boots are another popular choice in the city with leather laced-up boots or Chelsea boots worn by many. A good, comfortable, and waterproof pair of boots are ideal for the cool, wet weather that often arrives during September.

T-Shirts

T-shirts are an essential item to pack for a trip to London in September and can be dressed up or down, layered to keep you warm or worn alone on sunny warm days.

During September, you will need to bring a selection of short-sleeve and long-sleeve T-shirts so you are prepared for all the temperatures that September will throw at you. This can include chiller days when you may need to layer them under a sweater or jacket.

Shirts

Smart shirts are typically worn in London during the evening or if you are going to an upmarket restaurant or venue that has a smart dress code.

Whereas relaxed shirts can be worn during the day in September, especially when it gets sunny. If you typically wear shirts then you will not look out of place wearing a button-up shirt in London.

Warm-weather accessories

Temperatures in London during September can reach above 20°C (68°F) so ensure you are prepared for the sun by packing

• hats such as baseball hats
• sunglasses
• sunscreen – yes, even in September
• water bottle to stay hydrated.

Detailed Outfit Guide | From Early to Late September

The month of September is known as a transitional month as the season changes from summer to autumn, so the weather can be both sunny and chilly.

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To make sure you are prepared for your vacation to London, I will share with you everything you need to pack for a trip to the city in September.

Typical evening wear in London during September includes jeans and a sweater with a light jacket. Remember the temperatures can drop in the evening and the weather can be varied during September, even early in the month. One evening you may only need a sweater then the next evening you may need a sweater and a jacket to keep warm, especially if it rains, so come prepared.

Early September

Early September is warm with summer-like temperatures quite common in the first week. Average temperatures for early September are around 21°C, which can feel quite warm in London.

Jeans and a T-shirt with a smart pair of trainers will keep you comfortable and stylish in the city. For women, a light dress and a cardigan or jeans with a blouse or T-shirt will be ideal for daywear.

For men long shorts and a shirt or T-shirt will keep you cool and comfortable, and children can wear similar outfits.

A light jacket such as a denim jacket or a cotton trench coat is ideal for covering up during early September when there is a breeze in the air and will be ideal in the evening when the temperatures drop.

Make sure to also bring a hat, such as a baseball hat to add a sporty feel to your outfits and to also protect you from the September sun.

Mid-September

Mid-September sees the weather getting milder as cooler temperatures begin. During the day it can still be sunny however a colder breeze brings the beginning of autumn. If you are visiting London during mid-September you will need some layers to keep warm.

Bring long-sleeve t-shirts, medium-weight sweaters and a rainproof jacket to protect from the wind and the rain.

Late September

Late September has much colder temperatures compared with the beginning of the month with a higher chance of rain. Late September is when the weather can be the most changeable with cold rainy days followed by sunny warm temperatures.

Although you will still get plenty of sunshine hours during the day don’t be fooled into thinking it will be warm outside. Be prepared by bringing sweaters, waterproof footwear and warm rainproof jackets but still pack your sunglasses.

Personal Experiences and Tips

As a Londoner who lives in the city, I have experienced glorious warm weather during September, especially in the first week of the month when summer-like temperatures can be expected.

Looking back on previous years we are usually in summer wear the first week of September wearing shorts and dresses. The weather in September is warm and comfortable, and extreme weather conditions are rare.

However, in 2023 London did have a heatwave during September when temperatures reached 33.5°C and everyone was very hot.

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Despite this, heatwaves in early autumn are uncommon. However, you should still expect moderately warm weather early in September and cooler autumn weather towards the end of the month.

Prepare for weather changes by bringing light layers and easy-to-adjust outfits. For early September, expect some sun, so bring sunwear such as sunhats, sunglasses, and SPF for daytime. If you are coming in late September bring a waterproof coat so you are ready for any sudden rain showers or chilly breezes.

The city of London is known for being very fashionable, however, day-to-day fashion in London is smart casual with an emphasis on dressing comfortably.

Layering

When it comes to keeping warm when the weather turns cold in September, bring cardigans, zip-up jumpers or hoodies to layer under jackets. This allows you to adjust your outfit depending on the temperature and feel more comfortable as you navigate the city.

I like to wear a smart trench coat layered over light knitwear as a versatile option for September and I’m often in a pair of trendy sneakers as I walk a lot around the city. My husband wears a light puffer jacket with a hood in late September and wears dark jeans, trainers, a shirt and smart boots for evening wear.

Bonus: 5 Must-Do Things to Do in September

Please try to do at least one of the following activities in September. Number 5 is our absolute favorite.

1. River Thames Evening Cruise with Bubbly

• Location: Westminster Pier, London
• Price: £32 per person
• Personal Rating: 5/5

Sipping on bubbly, enjoying delicious canapés, and being serenaded by a live musician while gliding along the River Thames was magical. Seeing London’s landmarks beautifully illuminated in the evening made the experience even more special.

Why September? The weather is still pleasant!

Helpful Tip: As it can get slightly cooler on the river, it’s a good idea to bring along an extra layer.

2. Have Dinner in the Clouds at Duck and Waffle

• Location: 110 Bishopsgate 40th Floor, Heron Tower, London
• Price Range: $$
• Personal Rating: 5/5

Once we found the building, we whizzed up to the 40th Floor in a glass lift, which isn’t for the faint-hearted. The food was amazing and the entire restaurant had a chilled and relaxed feel. Of course, the views over London were spectacular which made the meal even more enjoyable.

The views across London are the most romantic at sunset.

Helpful Tip: Booking for the restaurant opens exactly two months ahead of time. So you have to be organized to get a table.

3. Take a romantic aerial walk above the famous O2 Building

• Location: The O2, North Greenwich, London
• Price Range: $
• Personal Rating: 4/5

It was so much fun walking over the roof of the O2. Our guide was so lovely and told us so much about the London skyline, made us feel safe, and even took a few photos for us. It was an amazing experience to do as a couple.

This is a great summertime activity in June, and depending on what you want to see, you can choose a daytime or a twilight walk.

Helpful Tip: Wear comfortable clothes and shoes. You will be wearing a harness so ladies should avoid wearing a dress. Even if the weather is warm, take a light jacket as the rooftop can get chilly.

4. Stroll Through the Royal Botanic Gardens, Kew

• Location: Richmond, London
• Price: £17.50 per adult
• Personal Rating: 4.5/5

The diversity of the gardens was astounding, from the Palm House filled with exotic rainforest plants to the Japanese Garden which was tranquil and serene. It was the perfect place for a peaceful day out.

Helpful Tip: Don’t forget to check out the Treetop Walkway for a unique perspective of the gardens from 18 meters high.

5. Visit the Borough Market

• Location: Southwark, London
• Price: Free
• Personal Rating: 4.5/5

The bustling atmosphere and the wide variety of delicious food and drink on offer made for a fun day out.

August is perfect because of the pleasant temps.

Tip: The market is less crowded in the morning on weekdays.