Temperatures may continue to climb across the UK as the country enjoys an unseasonably warm February, forecasters say.
Becky Mitchell, a Met Office meteorologist said figures of 17C and 18C were expected in the coming days, adding: “It could possibly get even warmer still.”
Sunday night is expected to be clear for many, although there will be patches of cloud across Scotland and parts of Northern Ireland.
Patches of fog and mist are also likely to develop across central, northern and eastern England.
The Met Office has issued a yellow weather warning for fog, which will be in force between 8pm on Sunday and 10am on Monday over parts of northeast England and Yorkshire.
The fog is likely to lead to travel disruption in the area on Sunday evening, the authority believes.
Slower journey times with delays to bus and train services are possible.
“There is a chance of delays or cancellations to flights,” a spokesperson for the Met Office said.
Overnight frost is also likely to develop in parts of central and southern England.
Mist and fog patches will clear on Monday morning, but the afternoon is expected to be largely dry and sunny with some rain in northern Scotland.
A weak front will move into Scotland by Tuesday, bringing slightly cooler weather to the region.
While Tuesday will be “very mild” and warm in England, Wales and Northern Ireland, conditions will be colder and damper in Scotland.
Much of the warm weather in the coming week is forecast for Wales, where temperatures hit 18.8C on Sunday, making it the warmest February day in the country since 1990.
The temperature might have been affected by a phenomenon known as the Foehn Effect, a dry and warm down-slope wind that occurs to the lee of hills or mountains.
Should temperatures rise to 20C before Friday, it will be the earliest in the calendar year that such a milestone has been reached anywhere in the UK.
Additional reporting by agencies
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