2025 ranks among island’s hottest years on record
- Jan 28
- 2 min read
Jersey experienced its fourth hottest year on record in 2025, according to newly released figures from the island’s Met Office.
Forecasters said the year was also the fourth sunniest since records began, with 2,383 hours of sunshine logged.
The island’s average annual temperature reached 13.3°C — nearly one degree higher than the 30-year norm.
Paul Aked, head of meteorology at Jersey Met Office, said the figures underline a clear warming trend and warned residents to expect increasingly severe weather conditions in the future.
“Warmer temperatures mean the atmosphere can hold more moisture,” he said. “That raises the risk of heavier rainfall and more extreme weather events.”
The data show that spring 2025 and the month of June were the warmest on record. June included the island’s hottest day of the year, when temperatures peaked at 33.4°C, alongside several other days that exceeded heatwave thresholds of 30°C.
Forecasters also recorded a rare “tropical night” in June, when temperatures did not fall below 20°C overnight - a phenomenon more commonly associated with much warmer climates.
Sea temperatures during the summer months were the second warmest on record, adding to concerns about the broader impacts of rising heat on the island’s environment.
Despite the warmth, rainfall levels were mixed. Eight months of the year were drier than average, even though January became the wettest January since records began. Total annual rainfall reached 823.6mm, nearly 95mm below the long-term average.
Cold conditions were notably scarce. 2025 was one of only 12 years on record without any air frost, while the number of ground frost days fell to 21 — less than half the typical annual figure. The lowest temperature of the year was recorded on 3 January at just 0.1°C.
The findings will be reflected on Jersey’s Climate Stripe wall, where another dark red stripe will be added to represent the elevated average temperatures of 2025. The installation provides a visual timeline of the island’s climate data dating back to 1894.
Meteorologists say the latest figures reinforce the need to plan for a future shaped by rising temperatures and increasingly volatile weather patterns.
