Highest temperature in London on June 12?

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Market context

On 12 June 2026, the highest temperature recorded at London City Airport Station will fall into one of several defined ranges in Celsius. Resolution depends on historical data published by Wunderground for that specific date and location, with the settlement window closing at midday UTC. The 0% crowd probability suggests traders currently perceive no meaningful likelihood of an extreme heat outcome, though the market structure accommodates multiple temperature bands to capture realistic variation.

London's June temperatures historically cluster between 18°C and 24°C, with extremes rarely exceeding 28°C at City Airport. The UK Met Office records show only three occasions since 1990 when London experienced temperatures above 30°C in June, each tied to sustained continental high-pressure systems. The current zero probability may reflect either underpricing of tail-risk heat events or rational assessment that June 2026 conditions will track seasonal norms. Comparable markets on UK summer temperatures have typically resolved within 2–3°C of long-term June medians, suggesting the crowd's caution aligns with climatological precedent.

Traders should monitor the UK Met Office's extended-range forecasts from late May onwards, particularly any signals of a blocking high-pressure pattern over northern Europe. The Met Office publishes monthly outlooks roughly six weeks ahead; a June 2026 forecast indicating above-normal temperatures would be a material catalyst. Additionally, the North Atlantic Oscillation phase and sea-surface temperatures in the Atlantic basin, typically reported in May climate bulletins, influence whether warm continental air reaches the UK. Settlement hinges entirely on Wunderground's historical database entry for London City Airport on that date, making data availability the final dependency.

Methodology

This page is a comparison snapshot: one live quote (Polymarket), four reference venues with their key attributes, and a single execution path — every trade button routes to Polymarket Legal UK, which mirrors the Polymarket order book directly.

Resolution & payout

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

FAQ

Is this market available outside the US?

Polymarket Legal UK is available in most jurisdictions where Polymarket isn't directly accessible. Polymarket itself is geo-blocked in the US/UK/EU. Always check local regulations.

How does resolution work?

Through the UMA Optimistic Oracle on Polygon: a proposer submits the outcome, a two-hour challenge window opens, and USDC payouts settle automatically once the result is final.

What's the difference between YES and NO shares?

A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.

What does it cost to trade on Polymarket Legal UK?

Zero. Polymarket Legal UK routes every order to the live Polymarket order book; the only cost is the Polygon network fee, typically under $0.01 per transaction.

How fast are USDC deposits?

Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within minutes.