Glastonbury festival-goers “may need to take shelter if they can” as thunderstorms are set to sweep across much of southern England, a Met Office meteorologist has warned.

A Met Office yellow weather warning for thunderstorms was issued yesterday (June 22) which takes up much of England and Wales, including Somerset.

The sunny weather that was experienced yesterday at the festival is no longer to be seen and punters could be caught in torrential downpours.

Meteorologist Sarah Kent, from the Met Office, told the PA news agency: “They are going to have a really warm night which is good news for people who are camping out there of course and a lovely start to the day, pretty much wall-to-wall sunshine.

“With that the heat will be gradually building through the morning and it’s that heat that could be part of the problem for the weather in the afternoon because we are looking at scattered showers coming in from the south.

Burnham and Highbridge Weekly News: Glastonbury attendees enjoyed warm weather on the first day of the event (PA)Glastonbury attendees enjoyed warm weather on the first day of the event (PA)

“Those showers will be locally heavy and could be thundery, which is why we have a thunderstorm warning out from 10am all the way through to 11.59pm.”

The meteorologist said that the nature of thundery showers are that they are “hit and miss”.

She added: “We know they are going to occur, but whether they happen exactly in one particular point is extremely hard to get right even this far ahead so it’s a risk.

“If you did get a downpour tomorrow it is likely to be heavy and from blustery winds potentially tied in and the threat of some lightening as well – so it’s just to keep that in the festival-goers’ attention."

Festival-goers have already been warned to pack for all eventualities – and take their wellies – at Glastonbury, with light showers predicted on Friday and Saturday, followed by more heavy rain on Sunday.