4. Exeter & Swansea – West’s Rainfall Hotspots
Though not major metropolises, cities like Exeter and Swansea rank among the UK’s top flood-prone urban areas. Data based on 2024 rainfall levels shows:
- Exeter: 1230 mm
- Swansea: 1210 mm
They are followed closely by Glasgow (1182 mm), Plymouth (1157 mm), and Cardiff (1112 mm)—all highlighting the unusually high rainfall affecting the western and southern UK.
Why autumn matters: This is when Atlantic storms start picking up, bringing intense periods of rain—especially perilous for cities already experiencing high annual totals.