Perfect weather forecast for London Marathon as more than 50k runners set to take to the streets

Participants run with the London Eye in the background at the 2018 London Marathon
Runners can expect excellent weather on the big day -Credit:NIKLAS HALLEN/AFP via Getty Images

The London Marathon is going ahead tomorrow (Sunday, April 21). As over 50,000 people prepare to take on the mammoth challenge, the Met Office has predicted stellar conditions for the big day.

Temperatures will rise to no more than 13C, saving runners from excessive heat. The marathon kicks off at 9.05am, at which point it will be partially sunny and seven degrees.

All start lines will be closed by 11.30am, when it will still be partially sunny with temperatures of nine degrees. Throughout the day, it's expected to become cloudier throughout the day before the sun peeks back through at 4pm, with clear skies from 7pm onwards.

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Runners in the London Marathon pass Buckingham Palace
Runners can expect highs of 13C -Credit:Peter Macdiarmid/Getty Images

Temperature-wise, highs of 12 to 13C are expected between 2pm and 5pm. The temperature will remain in double digits until 8pm, when it will dip down to a low of five degrees overnight.

You can expect winds of 11 to 12mph throughout the day, with gusts of up to 24mph. The wind will be coming from a north-northeast direction all day.

With a higher UV level expected from midday onwards, marathon runners should consider sunscreen. Speaking in the Met Office’s London Marathon forecast on YouTube, Met Office Meteorologist and Presenter Alex Deakin said: “If you’ve been training hard for the London Marathon, you’ve probably been training in the rain and under the influence of low pressure.

"Our weather patterns are shifting this weekend and high pressure moving in will bring many of us a fine day on Saturday. That high sticks around on Sunday for the big race but it starts to edge back a bit further west which means there will be a bit of a northerly breeze in the southeast and quite a bit of cloud around as well.

"The sun is strong this time of year so while 13°C in the afternoon is still on the cool side during the race, if you are running once the sun pops up then it will feel pretty warm.”

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