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 venues work together to support Vale Earth Fair
Royal Guernsey goats on show at Government House
Grassroots Guernsey football clubs get matchday ball donation
New operator sought for Guernsey's Digital Greenhouse
One fifth of Year 1 schoolchildren in Guernsey overweight
Sark Shipping told to get its finances in order
Reliability of Alderney airlinks to be reviewed
Guernsey's final summer show cancels the fireworks display