SWINDON'S weather forecast has been updated following the Met Office issuing its first-ever warning for extreme heat.

Temperatures are rising to 30 degrees Celsius today and could stay that high on Tuesday as well, with lows of a still-warm 18C.

Thunderstorms are expected around 4pm and 5pm on Tuesday following hours of sunshine, which will return after the storms pass in the evening.

The sunshine, high temperatures and weather warning will continue into Wednesday and Thursday, with highs of around 29C and 27C respectively as well as lows of 16C and 15C.

Pollen levels and UV rays will be very high and strong.

A Met Office spokesman said: "High temperatures both by day and night will continue this week leading to public health impacts

"Adverse health effects are likely to be experienced by those vulnerable to extreme heat.

"The wider population are likely to experience some adverse health effects including sunburn or heat exhaustion (dehydration, nausea, fatigue) and other heat related illnesses.

"More people are likely to visit coastal areas, lakes and rivers leading to an increased risk of water safety incidents.

"Some changes in working practices and daily routines likely to be required.

"An increased chance that some heat-sensitive systems and equipment may fail, leading to power cuts and the loss of other services to some homes and businesses.

"Some delays to road, rail and air travel are possible, with potential for welfare issues for those who experience prolonged delays."