Cornwall is braced for a surge in temperatures over the coming days. The Met Office is predicting a heatwave to hit areas of the county with the mercury set to top 25C.

The forecaster said the heatwave threshold is met "when an area records a period of at least three consecutive days with daily maximum temperatures meeting or exceeding the heatwave temperature threshold". Cornwall has a heatwave threshold of 25C which is set to be met from tomorrow (Monday, July 29) until Wednesday (July 31).

Locally, Truro is set for high temperatures of 25C tomorrow and Tuesday before the mercury rises to 26C on Wednesday. Conditions will then get cooler at the end of the week and next weekend.

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Looe is also set for a heatwave with temperatures expected to hit 28C on Tuesday. The town will see the mercury hit 25C tomorrow and 27C on Wednesday.

Meanwhile, other areas such as Falmouth, Newquay and Penzance will not meet the heatwave criteria. However, they can still expect sunny weather and temperatures in the early to mid 20Cs.

The Met Office said: "Heatwaves are most common in summer when high pressure develops across an area. High pressure systems are slow moving and can persist over an area for a prolonged period of time, such as days or weeks.

"They can occur in the UK due to the location of the jet stream, which is usually to the north of the UK in the summer. This can allow high pressure to develop over the UK resulting in persistent dry and settled weather."

Met Office 5-day forecast for the South West

Today: Any early fog lifting into low cloud and clearing by mid-morning. Thereafter a fine day with plenty of sunshine and some fair weather cloud. Feeling much warmer than yesterday with light winds. Maximum temperature 25 °C.

Tonight: A pleasantly warm and mostly sunny evening and staying dry overnight with lengthy clear periods. A few pockets of mist forming in the countryside. Not as cool as last night. Minimum temperature 11 °C.

Monday: Another very warm day with plenty of sunshine, though perhaps turning somewhat cloudier through the afternoon, with the sunshine possibly becoming hazier. Sea breezes developing but winds remaining light. Maximum temperature 27 °C.

Outlook for Tuesday to Thursday: Staying generally fine and settled at first with hazy sunshine at times. Feeling very warm or hot with winds staying light. A chance of thundery showers on Wednesday and Thursday.