It was a mild night for most but much of England and Wales had patches of fog or mist in places, especially across southern England.
The best of the clearer conditions were over northwest England. Scotland and Northern Ireland had a cloudy night, with spells of rain affecting northern Scotland.
During the morning, across England and Wales, mist and fog quickly burnt off with most places seeing almost unbroken sunshine.
This allowed temperatures to rise rapidly, which in turn triggered a line of heavy showers from Merseyside to northeast England.
However, fog was slow to clear in Lyme Bay and later spread from the North Sea into parts of East Anglia. Across Northern Ireland and Scotland, it was a cloudier and cooler day with some fairly persistent rain across western Scotland in particular.
However it did brighten up at times across eastern areas. It was the warmest day of the year so far for many parts, with temperatures peaking across southeast England.
Extremes of temperature, rainfall and sunshine for the 24 hours ending 26/06/2011
Highest day max: St James's Park : 29.2C
Lowest day max: Fair Isle: 13.3C
Lowest night min: Kinbrace: 7.4C
Highest rainfall: Cluanie Inn: 27.4mm
Highest sunshine: Camborne: 15.4 hours