Highest temperature in London on June 11?

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Market context

On 11 June 2026, the highest temperature recorded at London City Airport will fall into one of several defined ranges. A YES share in any given temperature bracket means you believe the day's peak will land there; a NO share means it won't. The settlement source is Wunderground's historical data for that specific station, which records hourly observations throughout the day. The market resolves once the final reading is confirmed, typically within hours of the settlement window closing at midday UTC on 12 June.

London's June climate is relatively stable, with historical highs typically between 20–24°C at City Airport. The 0% crowd probability across all ranges suggests either extreme uncertainty about which bracket will resolve, or that traders are awaiting clearer atmospheric forecasts before committing capital. June 2026 sits far enough ahead that seasonal models remain broad; however, comparable years show that early summer heat waves occasionally push London into the 26–28°C range, whilst cooler maritime influences can suppress peaks to 18–20°C.

The key variable is the North Atlantic Oscillation phase and any blocking high-pressure system that might establish itself over the British Isles in early June 2026. Traders should monitor Met Office seasonal outlooks released in April and May, which typically refine temperature expectations for specific regions. Any significant shift in long-range forecasts—particularly signals of continental warm air advection or Atlantic low-pressure systems—will likely trigger movement in the market's probability distribution away from its current flat state.

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). The odds column is filled only where we have clean data — that avoids the made-up numbers that get a network demoted when search engines cross-check against the source venue.

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?

Prediction Market 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 does it cost to trade on Prediction Market UK?

Zero. Prediction Market 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.

How reliable are the quoted odds?

The YES/NO percentages are the live mid-prices of the Polymarket order book. On deep markets they move every few seconds; on thinner ones you'll see short plateaus.