Isle of Portland, Dorset, England
Portland Bill's limestone cliffs and lighthouse are a spectacular walk — but the Portland Race offshore is one of Britain's most dangerous stretches of water. CoastMetric combines tidal, swell and weather data so you know what you're walking into.
About Portland Bill
CoastMetric is a real-time conditions app for Portland Bill — the dramatic limestone peninsula that juts into the English Channel at the southern tip of the Isle of Portland. The Portland Race tidal overfalls are one of the most dangerous stretches of water in UK coastal waters.
The Portland Race offshore creates violent overfalls that can affect conditions on the clifftops. Large waves can surge over the lower rock ledges at the Bill in heavy swells or south-westerly gales. There are no beaches at Portland Bill — any person who enters the water faces extreme difficulty escaping.
Walking Routes
Check the live Visit Score before you set out — conditions here change fast.
The full clockwise circuit of the Bill along both cliff edges — west coast then east coast back. Easy walking on good paths. Allow extra time for the bird observatory and lighthouse café.
Plan Your Visit
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Key Features
One of the most dangerous stretches of water in UK coastal waters — tidal overfalls offshore from the Bill where the Channel tides meet. Visible from the clifftop as white water and breaking waves even in calm conditions.
Trinity House lighthouse built in 1906 — still operational. The red sectors on the light warn ships of the Race. Café and heritage exhibition inside.
A dramatic free-standing limestone pinnacle at the Bill — a natural rock podium above the sea. Cliff jumping is prohibited and extremely dangerous.
Live Data
All data is fetched from authoritative UK sources and recalculated every few minutes.
Safety Information
Portland Bill is a headland walk — there are no beaches and no safe access to the water. Stay well back from the wave-washed rocks below the lighthouse in any swell. The Chesil Beach at the northern end of Portland is a storm beach — waves can overtop the bank in strong southerly gales. The lighthouse is privately operated; café on site.
All data, scores and recommendations are for informational purposes only. The Visit Score is an algorithmic estimate — not a substitute for your own judgement, local signage or official guidance.
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