Overview
- The UK’s annual mean temperature reached 10.09C, surpassing 2022’s 10.03C and marking only the second year the average has exceeded 10C.
- Sunshine totaled 1,648.5 hours across 2025, 61.4 hours more than the previous record set in 2003.
- Every month except January and September was warmer than average, delivering the warmest spring and summer on record.
- Four heatwaves from mid-June to mid-August triggered drought declarations, reservoir levels falling below half in some areas, and hosepipe bans by several water companies.
- The milestone fits a clear warming trend, with four of the past five years in the UK’s top five warmest, as Copernicus expects 2025 to rank second or third globally.