What are the hottest Tube lines? (Picture: PA)

Some London Underground lines will get so hot during the heatwave this week it will be almost unbearable trying to commute to and from work.

But which Tube lines are the hottest?

According to Transport for London (TfL), during a hot spell this time last year, the Bakerloo line – one of the oldest on the network – was the hottest.

It his 31.04°C, while the Central line, which came second, rose to 30.47°C.


The coolest line without air conditioning was Waterloo and City with the hottest temperature recorded at 25.95°C.

Figures were taken from the average hottest recorded temperatures for the Bakerloo, Central, Jubilee, Northern, Piccadilly, Victoria and Waterloo and City lines in August 2018 – but could be even hotter this week, as outside temperatures will hit at least 32°C today in the south of England.



And Britain is braced for a record hot day on Thursday, when temperatures are expected to reach 35°C or potentially even hotter in London.

London's hottest Tube lines in 2018 For London Underground lines without air con (could it get even hotter this year?) Bakerloo 31.04°C Central 30.47°C Jubilee 26.57°C Northern 27.98°C Picadilly 27.3°C Victoria 28.03°C Waterloo and City 25.95°C

While the official figures show the Tube sitting at most in the low 30s, BBC weather presenter John Hammond last year took a thermometer on a Piccadilly Line train and discovered unbearable heat.

His thermometer recorded a high of 39°C underground – more than 10°C hotter than outside temperatures on the hottest day of the year in London in 2018.

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TfL is warning passengers to carry water with them at all times and if it really is unbearable – you could always try walking between Tube stations instead.

Forecasters have said there is a chance of hitting 37°C on Thursday, which would put Britons in line for the hottest day on record.

The hottest July day recorded was 36.7°C at Heathrow Airport on July 1, 2015.

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