This summer in Guernsey was the second warmest on record.
Guernsey Met says the average temperature for June, July and August was 17.8 Celsius, compared to the thirty-year average of 16.2 Celsius.
The hottest day came on 30 June, at 30.4 Celsius.
Summer 2025 in Guernsey - 2nd warmest summer since records began in 1843. pic.twitter.com/bijIdtUhuA
— Guernsey Met (@GuernseyMet) September 3, 2025
It was also the third driest summer of the past 25 years, with less than a third of the rain we'd expect during the month of August.
Sea temperatures - measured in Jersey - were the second warmest since those records began in 1960.
August 2025 in Guernsey - 10th warmest August on record. pic.twitter.com/4qtLAzyiYh
— Guernsey Met (@GuernseyMet) September 3, 2025


Guernsey Museums close for the season
First visit of an EU ambassador to Guernsey
Hotel guests help grow a greener Guernsey
Guernsey man seeks donations after 2,000-mile challenge
Charity funds upgrades at Guernsey swimming pool
Under used Guernsey post boxes to close in early November
Capsized trimaran returning to France after Guernsey operation
Guernsey extends French ID card scheme into 2026