London Marathon Race Day Tips

London Marathon Weather Conditions

How Conditions Affect Clothing, Pacing, Fuelling and Hydration

London Marathon weather varies year to year, but spring conditions often mean cool starts with the risk of warming later.

On Cool Starts:

Be bold, start cold.

Dress for running, not standing. Use discardable layers during long waits.

Fuelling is often easier in cool conditions, but thirst cues can be muted. Stick to your fuelling plan rather than relying on feel.

On Warm or Sunny Years:

When temperatures rise, blood flow is diverted to the skin for cooling. Legs can feel heavier earlier and fuelling can feel harder.

Starting slightly slower allows the body time to regulate temperature.

If fuelling feels uncomfortable, easing pace briefly while fuelling often improves tolerance.

Hydration matters, but overdrinking can cause problems. Drink regularly without forcing fluid. Electrolytes help replace sodium lost through sweat.

Dress and plan for the conditions you will face in the middle and final third of the race, not just the start.

London Marathon Start Area Guide

Pens Toilets and Fuelling

Start logistics are complex and involve significant walking and waiting.

Arrive early, stay calm and conserve energy.

Dress for standing around. Disposable layers are essential.

Toilet queues build quickly. Go early and use opportunities when you see them.

Many runners use Night Fuel the evening before to support recovery and sleep.

On race morning Morning Fuel works well for runners who struggle with solid food.

If breakfast is early and the gap to the start is long, FeelGoodBars provide steady energy without sitting heavily.

Sipping an Energy Fuel over breakfast or on the way to the event helps ensure hydration and muscle readiness.

Calm breathing helps reduce nerves and stomach discomfort.

London Marathon Crowd and Atmosphere

What to Expect

Crowd support is intense through much of the race.

This energy can be motivating but also overwhelming.

Use the noise to lift your mood, not your pace.

There are quieter sections in Docklands and after Canary Wharf. Being ready for this mentally helps avoid unnecessary dips.

The finish atmosphere is electric and often provides a final emotional lift.

London Marathon Pacing and Fuelling

How to Run the Course Well:

The biggest mistake at London is running the first half too fast.

PB chasers should aim to feel slightly restrained early and fully in control at halfway.

Being ahead of schedule at mile thirteen means very little if the wheels come off later.

Fuel targets for new and mid-pack runners should aim for forty to sixty grams of carbohydrate per hour.
Faster runners are often sixty to eighty grams per hour using Sport Jelly or combined with Energy Fuel.

Runners at a steadier pace may still find FeelGood Bars useful later if breathing allows.

Weather and crowd energy usually matter more than elevation.

London Marathon Race Day Tips

Shared by Finishers

- Start slower than you think you should.
- Fuel earlier than you think you need to.
- Fuel regularly, especially in the first half.
- Save caffeine for the final third for a mental lift.
- Do not get carried away by the crowds.
- Expect quieter sections and accept them.
- Do not panic if pace drifts.
- Everyone finds the final miles challenging.

First timers should focus on soaking up the experience.
PB chasers should remember that control beats aggression.

London Marathon Race Week and Post Race Checklist

In race week reduce volume but keep light intensity.

Eat normal foods with a gentle carbohydrate focus.

The night before many runners use Night Fuel.

On race morning use Morning Fuel on waking. Use a FeelGood Bar if the gap to the start is long. Sip an Energy Fuel if needed.

During the race use Sport Jelly regularly and Energy Fuel if carrying fluid.

After finishing take Recovery Fuel as soon as practical to support muscle repair and reduce next day soreness.

And finally, breathe, relax and enjoy.
We run for pleasure — enjoy the process.

If you’d like a deeper dive into fuelling strategies, carb targets and pacing guidance, you can read the full Mountain Fuel Road Marathon Nutrition Guide