Cooler Saturday gives brief relief before heat returns

Cooler Saturday gives brief relief before heat returnsImage source, Getty ImagesByBen RichLead Weather PresenterPublished19 minutes agoCommentsSaturday could provide momentary respite from the heat after sunshine lifted temperatures above 30C (86F) in parts of the UK on Friday.Fresher air pushing in from the west should suppress temperatures - although highs of 27 or 28C (81-82F) are still expected in south-east England.Most places should be dry with sunny spells and just a chance of an isolated shower.However, temperatures are set to rise again on Sunday before climbing further on Monday and Tuesday as a Met Office amber warning of extreme heat takes effect.Will a heatwave be declared on Saturday?For a hot spell to officially become a heatwave, temperatures must exceed a threshold - which varies from 25-28C (77-82F) in different parts of the country - for three consecutive days.There are parts of south-east England that have now recorded two days above this threshold so a third, on Saturday, would mean a heatwave being declared.However it is possible that maximum temperatures may fall slightly short of these highs.Scotland, Northern Ireland and Wales - along with northern and western England - will be significantly cooler with afternoon highs expected to reach 16-24C (61-75F).You can check the forecast temperatures for your area on the BBC Weather website and app.Image caption, Sunday will bring a return to hot weather, especially in the south and eastWhether or not we reach official heatwave criteria, temperatures will start to climb again on Sunday.Sunny spells are expected in most areas and temperatures are expected to peak at 27-31C (81-88F) in parts of the Midlands, Wales and southern England.Some areas of northern England will reach 23 or 24C (73-75F) while much of Scotland and Northern Ireland will be at 20-22C (68-72F), away from the far north.High UV and pollen levels are anticipated in many places.Staying safe in water when the weather's hotPublished...