The Met Office has forecast that Blackburn will be hotter than Ibiza this week as another heatwave hits the UK.
In East Lancashire, temperatures are expected to reach 29C on Friday, July 10.
The rest of the week is set to remain warm with continuous sunshine.
The outlook is similar in Blackburn, Burnley, Hyndburn, the Ribble Valley, Pendle, and Rossendale.
In Ibiza, temperatures are set to peak at 28C on Friday, one degree cooler than the highs forecast in Blackburn, according to the Met Office.
A yellow heat health alert has been issued for the North West.
It starts on Wednesday, July 8, at 9am and is in place until Sunday, July 12, at 9pm.
The UK has entered its third heatwave in as many months, with temperatures expected to climb as high as 35C in some areas later this week, the Met Office has said.
South East England has now officially met the heatwave criteria, after three days of temperatures above 28C, according to the forecaster.
Temperatures are set to continue to rise across the UK throughout the week, and more regions are likely to reach their local heatwave thresholds, it added.
Parts of southern England could see temperature highs of about 32C on Tuesday, rising to 33C on Wednesday and 34C on Thursday, with the highest readings of 35C forecast for isolated areas on Friday and Saturday.
On Monday, the highest temperature was recorded as 34C in Teddington, south-west London, the Met Office said.
But, by the weekend, the warm air is forecast to reach northern parts of the UK, and conditions are set to become increasingly humid, with a growing risk of showers or isolated thunderstorms.
Early next week, temperatures are likely to fall slightly, though many areas will stay dry and warm, the Met Office said.
Its deputy chief forecaster, Steven Keates, said people should “take the usual precautions with the heat and the sun”.
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He said: He said: “Parts of the UK are entering heatwave conditions: the third heatwave in the UK so far this year.
“However, unlike the May and June heatwaves, we are not expecting this heatwave to be record-breaking.
“Temperatures this week are not expected to reach the highs we witnessed last month, though parts of southern England in particular are likely to see several days in the low 30s, and a few places could reach 34-35C later this week.”
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