Embrace Layers for Temperature Swings
London in September can go from comfortably warm to briskly cool within the same day. Dressing in layers means you'll be prepared for anything, allowing you to easily adjust to indoor heating or outdoor chills.
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Weather in London in September
September in London is typically mild, with average high temperatures around 68°F (20°C) and lows around 52°F (11°C). While rainfall is common throughout the year, September sees an average of 10-12 rainy days, so expect some showers. Humidity levels are moderate, usually ranging from 60-80%. You can also anticipate around 13 hours of daylight at the beginning of the month, gradually decreasing to about 11.5 hours by the end.
What to wear in London in September
Layering is key for London in September! Think versatile pieces you can easily add or remove as the weather changes. Londoners generally dress smart-casual, so lean towards polished yet comfortable outfits. Don't forget comfortable walking shoes, as you'll likely be doing a lot of exploring on foot.
Essentials for London in September
Waterproof Jacket
A lightweight, packable waterproof jacket is essential to ward off unexpected September showers without adding bulk.
Compact Umbrella
Even with a waterproof jacket, a sturdy travel umbrella will be your best friend for sudden downpours and keeping your hair dry.
Comfortable Walking Shoes
You'll be doing a lot of walking, from museum halls to city streets, so supportive and comfortable shoes are a non-negotiable.
Layering Cardigan or Jumper
A versatile cardigan or light jumper is perfect for layering when temperatures drop in the evenings or indoors.
Scarf
A stylish scarf can add warmth on cooler days and elevate a simple outfit, making it a functional fashion accessory.
Portable Power Bank
Keep your phone charged for navigation, photos, and staying connected while you're out and about exploring all day.
Reusable Water Bottle
Stay hydrated on the go and reduce plastic waste by refilling your bottle at various public water fountains and cafes.
Cross-body Bag
A secure cross-body bag keeps your valuables safe and accessible while navigating crowded attractions and public transport.
Travel Adapter (Type G)
Don't forget the correct adapter for your electronics; the UK uses Type G outlets with three rectangular pins.
Small Daypack
A lightweight daypack is perfect for carrying your daily essentials, like your jacket, umbrella, and souvenirs.
Pro tips
Always Have Rain Gear Handy
Even if the forecast looks clear, a pop-up shower is always a possibility in London. Keep your waterproof jacket and umbrella in your day bag at all times.
Master the Art of Smart-Casual
Londoners generally dress a bit more formally than in some other major cities. While you don't need to be in black tie, aiming for smart-casual will help you blend in and be appropriate for most occasions, from pub visits to theatre shows.
Prioritize Comfortable Footwear
You'll be walking miles, whether it's through sprawling parks, historic streets, or vast museums. Blisters are no fun, so invest in comfortable, broken-in shoes that can handle a lot of pavement pounding.
Take Advantage of Shoulder Season Events
September is a fantastic time for festivals and events in London, from the Totally Thames Festival to Open House London. Research what's on before you go and pack accordingly for any specific activities you plan to attend.
Frequently asked
What is the likelihood of rain in London in September?
Expect around 10-12 days of rain in London during September. While it's not constant downpours, regular light showers are common, so always be prepared with an umbrella and waterproof outer layer.
Do I need warm clothes for London in September?
While September highs can reach 68°F (20°C), evenings and cooler days can drop to 52°F (11°C). A light jacket, a cardigan, and a scarf are advisable, especially if you plan on being out after dark.
What kind of shoes are best for walking around London in September?
Comfortable, closed-toe walking shoes are highly recommended. London involves a lot of walking, and some streets can be cobbled or uneven. Waterproof options are a bonus for rainy days.
Are there any specific events in London in September I should pack for?
September often features the Totally Thames Festival, London Fashion Week (if you're into fashion), and Open House London. Check event schedules closer to your travel date to see if you need any specific outfits for these or other cultural events.
What's the typical dress code for dining out in London in September?
For most mid-range restaurants, smart-casual attire is perfectly acceptable. If you're planning a visit to a high-end restaurant or a West End show, you might want to pack a slightly dressier outfit, though a blazer or nice jumper for men and a dress or tailored trousers for women are usually sufficient.
Is a hat necessary for London in September?
A hat isn't strictly necessary for warmth, but a light brimmed hat can be useful if you're sensitive to the sun on brighter days. For rain, your umbrella and jacket hood will likely suffice.