Does St Mary's Bay flood?

What the Environment Agency's rivers-and-sea flood-risk data says about St Mary's Bay

Ordnance Survey places 87 postcodes in St Mary's Bay in the Environment Agency's rivers-and-sea flood-risk dataset (Risk of Flooding from Rivers and Sea). Each postcode is counted once, under the worst band any of its properties reaches; together they hold 1,725 properties in the EA dataset's likelihood bands.

This dataset covers flooding from rivers and the sea only — one of five flood sources. Surface water, groundwater, sewers and reservoirs are assessed separately, so a postcode missing from it is not proof that a place cannot flood. The band describes the land around properties (allowing for defences), not any single address and not today's conditions.

Flood warning areas near St Mary's Bay

5 Environment Agency flood warning areas lie within 10 km of St Mary's Bay. The EA has issued 63 flood warnings and alerts for them since 2006, most recently on 22 Oct 2025.

• New Romney Sewage Arm from the Sewage Treatment Works to the Sea and from Littlestone Road to the Romney, Hythe and Dymchurch Railway, including New Romney
  14 warnings and alerts since 2006, latest Feb 2024 3.9 km
• New Romney Sewage Arm including Littlestone-on-Sea and The Greens
  2 warnings and alerts since 2006, latest Feb 2024 3.9 km
• Coastal areas from Folkestone to St Mary's Bay
  3 warnings and alerts since 2006, latest Feb 2020 4.4 km
• Coast and tidal areas from Sandgate to Lydd, including Hythe, Dymchurch, St Marys Bay, Littlestone, Greatstone, New Romney and communities on the Romney Marsh up to the Royal Military Canal
  41 warnings and alerts since 2006, latest Oct 2025 6.2 km
• Coastal areas from Littlestone Golf Course to Dungeness
  3 warnings and alerts since 2006, latest Mar 2025 10.0 km

Recorded floods near St Mary's Bay

Floods whose mapped extent (EA Recorded Flood Outlines) reached within ~5 km of St Mary's Bay, most recent first. Records, not floods: no outline on the record is not evidence a place has not flooded. See them on the map →

• 1 Jan 1990 — 07315D610_JAN1990_Canal Cut_Hythe Main river

Rainfall near St Mary's Bay

St Mary's Bay gets about 695 mm of rain a year on average (wettest month November, 85 mm; driest March, 39 mm). That is 40% drier than the UK as a whole, which averages 1,163 mm a year. Source: Met Office HadUK-Grid 1991–2020 (5 km grid), 1.3 km from the place centre.

The nearest rain gauge, Rainfall station (0.3 km away), recorded 2.0 mm in the last 24 hours and 44.2 mm in the last 7 days (latest reading 35 min ago).

At-risk postcodes in St Mary's Bay

Every postcode Ordnance Survey places in St Mary's Bay that appears in the EA's rivers-and-sea dataset, worst band first. Each links to its own flood-risk page.

High likelihood (13)

Low likelihood (5)

Very low likelihood (69)

Postcode districts

Sources

FloodRadar summarises public flood data. It is not a flood-risk survey of any property, and it does not replace official GOV.UK flood warnings or the GOV.UK long-term flood risk service.