After a brief reprieve from the heat, temperatures could reach almost 30C in parts of the UK due to a brief warm spell today.

Southern winds are set to bring hot and humid conditions back to England, with the hottest areas reaching 28C today.

The warm spell won’t last long, however – temperatures are expected to dip again later this week as rain and wind moves in.

From mid-September onwards, prediction of the weather is much less accurate.

The Met Office said: ‘As we head further into September, the distribution of rainfall becomes increasingly uncertain at this range. Settled or dry spells are still likely between weather systems.

‘Temperatures are likely to be around average overall, although some warm spells are possible, particularly in the south.’

WX Charts predicted that temperatures could reach 25C again by September 5 in southern England.

‘Intense’ thunderstorms and heavy rain across much of England and Wales could cause travel disruption this week, forecasters have warned.

After five heat waves this summer, Brits were relieved when bands of heavy showers and thunderstorms began moving in last week.

The UK is also bracing for a slew of storms and rainfall this autumn and winter brought by the pesky El Nino phenomenon.

El Nino happens every three to seven years when worldwide temperatures are pushed up by the weather system, which shifts ocean winds.

The natural warming of sea temperatures is forecast to reach more than 3°C in the coming months, making this year’s weather front ‘the largest since the 19th century,’ according to the Met Office forecasters.

‘We should be clear that this is an unprecedented event,’ Professor Adam Scaife, Met Office’s head of long range forecasting said.

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‘I have never seen an El Nino signal this intense in our forecasts.’

He added: ‘A typical El Nino leads to an equatorial Pacific sea-surface temperature rise of between one to 2°C, with 2°C being a really big event.

‘This implies that if the forecast is accurate – and other forecast systems show similar extreme values – then 2026 will far exceed our recent experience of El Nino and its worldwide climate influences.’

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