Every April, the London Marathon draws tens of thousands of runners and even more spectators to the capital’s streets. Whether you’re there to support a loved one, soak up the electric atmosphere, or simply enjoy one of London’s biggest events, knowing what to wear is essential.
Standing for hours outdoors in changeable British weather calls for a smart mix of comfort, practicality and style. From layering tips to footwear advice and accessories that make all the difference, here’s your ultimate guide on what to wear to watch the London Marathon in 2025.
1. Check the Weather First
Let’s start with the obvious: British spring weather can be unpredictable. One year, it might be sunny and 18°C; the next, drizzly and breezy. Check the forecast a day or two before the race, and plan your outfit accordingly.
Keep in mind:
- Early morning starts can be chilly.
- You may be standing in windy or shaded areas for long periods.
- Weather can shift quickly—layering is key.
2. Comfortable Footwear is Essential
You’ll likely be on your feet for hours—whether walking between checkpoints, standing at the finish line, or tracking your runner’s progress via apps and signage. Prioritise supportive, weather-appropriate footwear.
Best options:
- Trainers or walking shoes with arch support and cushioning
- Weatherproof boots if rain is in the forecast
- Avoid sandals or new shoes that haven’t been broken in
Top tip: Bring blister plasters or insoles if you’re prone to foot discomfort.
3. Dress in Layers
April mornings can start cool and warm up by midday. The best way to prepare for this is by wearing layers you can easily remove or add as needed.
Suggested layers:
- Base layer: Long-sleeve cotton or technical top
- Mid layer: Lightweight jumper, hoodie or fleece
- Outer layer: Windbreaker, packable rain jacket or light parka
Avoid bulky items—lightweight but warm fabrics like merino wool or thermals will serve you better.
4. Don’t Forget a Waterproof Jacket
The London Marathon happens rain or shine, so a waterproof or water-resistant jacket is always a smart idea. Look for something:
- Lightweight and easy to roll into a bag
- With a hood and zipped pockets
- Breathable if temperatures rise
Avoid umbrellas, which are awkward in crowds and can block other spectators’ views.
5. Opt for a Hands-Free Bag
You’ll want your hands free for clapping, cheering, and holding signs—so a crossbody bag, bumbag or small backpack is ideal.
What to pack:
- Phone and portable charger
- Snacks and reusable water bottle
- Tissues, plasters and hand sanitiser
- Sunglasses and SPF (just in case)
- Marathon tracker app on your phone
- Lightweight blanket or sit pad for comfort
6. Bring Something to Sit On (Optional)
If you plan to be in one spot for hours—especially near the finish line—it might be worth bringing a foldable stool, picnic blanket or foam seat pad. Just ensure it’s compact and portable, as crowds can get dense.
7. Embrace the Marathon Spirit
Watching the marathon isn’t just about standing around—it’s a celebration of endurance and support. Many spectators wear:
- Custom T-shirts with their runner’s name
- Bright colours so runners can spot them in the crowd
- Funny signs or flags to cheer everyone on
Feel free to dress up, wear fun hats, or go all out with balloons and banners—it’s all part of the fun.
8. Weather-Specific Dressing Tips
Here’s how to fine-tune your outfit depending on the forecast:
Sunny and mild (15–18°C)
- Breathable layers like cotton or linen
- Sunglasses and a wide-brim hat or cap
- Light jacket you can tie around your waist
Cloudy or drizzly (10–14°C)
- Long-sleeve base layer + water-resistant jacket
- Lightweight scarf or neck warmer
- Waterproof shoes or boots
Cold and wet (Below 10°C)
- Insulating mid-layer (fleece or knit)
- Waterproof coat with hood
- Thermal leggings or lined trousers
- Gloves and a beanie or thermal hat
9. What Not to Wear
A few things to avoid if you want to stay comfortable all day:
- High heels or flat-soled shoes – Your feet will thank you.
- Heavy coats – You’ll overheat or feel restricted.
- Large bags – Hard to carry and may be restricted in crowded areas.
- Jewellery or accessories that can snag in large crowds.
- T-shirts only – Unless it’s unusually hot, you’ll probably need layers.
10. Style and Comfort: It’s Possible
You don’t need to compromise on style to stay practical. Try:
- Neutral tones with pops of colour (scarves, beanies or signs!)
- A sleek raincoat or trench for minimalist appeal
- Monochrome trainers with joggers or structured jeans
- Layered knits with tailored outerwear
Comfort and functional fashion can go hand-in-hand, especially with today’s wide range of performance-meets-style brands.
Bonus: What to Wear If You’re Meeting a Runner After the Race
Many spectators like to meet their friends or family at the designated reunion zones near the finish line in St James’s Park. Here, you’ll want to look put-together for post-race photos and possible celebrations.
Quick freshen-up tips:
- Pack a travel-sized deodorant or face mist
- Add a layered necklace or accessories for polish
- Bring a change of top or clean jumper if you’ve been caught in rain or sun
Final Thoughts
The London Marathon is one of the city’s most inspiring days of the year. Whether you’re tracking a loved one or just cheering on thousands of strangers, the atmosphere is something truly special.
Dressing smartly—with comfort, weather-readiness and layers in mind—can make all the difference between a fun, relaxed day and a cold, soggy one. Use this guide to plan ahead, dress wisely, and enjoy every moment from the sidelines.