Town CLIMATE RISK

Staines-upon-Thames Flood Risk Data

Staines-upon-Thames is a town in Surrey, within the Spelthorne council area. LocalRisk has flood, heat, air and ground-stability data for 2,486 postcodes in Staines-upon-Thames; 12 samples are linked at the foot of this page.

9.2% of postcodes in Staines-upon-Thames fall into the Environment Agency's high flood-risk band - below the UK average of about 7%. A further 14.2% sit in the medium band; 76.6% are lower-risk. Two postcodes a few streets apart can land in different bands; what drives the gap is elevation, distance to the nearest watercourse, and how the surrounding drainage performs in heavy rain. The postcode list at the foot of this page links to the full address-level reading for each postcode in Staines-upon-Thames.

Met Office UKCP18 projections estimate around 39 days above 25°C per year across the Spelthorne area for the 2021-2040 period - the central scenario under high emissions; lower-emissions paths give lower numbers. Heat exposure within Staines-upon-Thames itself is uneven: top-floor flats, west-facing terraces and properties without through-ventilation hold heat well into the night, while ground-floor homes near tree cover or open ground cool faster. The headline 39-day figure is an area average, not a property-level reading.

Annual mean PM2.5 across the Spelthorne area is 7.9 µg/m³ - above the World Health Organisation guideline of 5 µg/m³ and within the UK Environment Act 2021 target of 10 µg/m³ by 2040. Within Staines-upon-Thames, readings are not flat: postcodes within 200 metres of an A-road or major junction routinely run 30-50% higher during weekday rush hours than residential streets two roads back. Defra's UK-AIR network supplies the underlying figure.

Ground stability in Staines-upon-Thames follows the underlying geology more than the postal boundary. The British Geological Survey GeoSure dataset maps clay shrink-swell risk on a 50-metre cell, and properties on the same street can sit in different bands where a clay seam ends mid-road. Pre-1980 housing on clay-rich ground is the most exposed; properties on bedrock or well-drained sandy soils are typically lower-risk. A postcode-level check picks up that variation.

A free postcode check on LocalRisk covers up to six hazards for any address in Staines-upon-Thames: Environment Agency flood mapping, BGS ground stability, Met Office heat projections, Defra PM2.5, plus coastal erosion and green-space access where relevant. The postcode list below opens an address-level report for each postcode in Staines-upon-Thames; the council link at the top of this page returns to the wider Spelthorne picture.