Temperatures are set to increase on Thursday, Friday and again on Saturday when they will potentially hit 29C, the Met Office said.
Beachgoers enjoying the warm weather at Helenâs Bay in Bangor, Northern Ireland.
The threshold for a heatwave is different across the UK, but in some areas it is classified as hitting highs of 25C to 28C across a three-day period. But as the weekend arrives there will be a risk of thunder and showers from the south-west to the north-east.
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