Highest temperature in London on June 16?

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Market context

On 16 June 2026, the highest temperature recorded at London City Airport Station will fall within one of several defined ranges, measured in degrees Celsius. The settlement will draw from historical weather data published by Wunderground, capturing the peak daily temperature across all recorded times at that specific monitoring station. The current crowd probability of 0% for any single outcome suggests either extreme uncertainty about which range will occur, or that traders have not yet committed capital to this market.

London's June temperatures typically range between 18°C and 24°C, though extremes above 28°C have occurred in recent decades during early summer heat events. The 2022 heatwave saw temperatures exceed 40°C in parts of England, though London City Airport's readings tend to run slightly cooler than central London owing to its riverside location. Historical precedent from comparable June markets shows that traders often underweight the tail risk of unseasonable warmth or cool spells, particularly when settlement windows extend months into the future and weather patterns remain genuinely uncertain.

Key variables affecting the outcome include Atlantic weather systems, the North Atlantic Oscillation phase, and any blocking high-pressure patterns that might establish themselves over northern Europe in mid-June 2026. The UK Met Office publishes seasonal outlooks and monthly forecasts that traders should monitor; its most recent long-range guidance will become more refined as spring 2026 progresses. Wunderground's historical data for London City Airport (EGLC) provides the definitive reference, and traders should verify the exact station location and measurement methodology before committing positions, as airport weather stations can differ materially from urban centre readings.

Methodology

This page reviews Highest temperature in London on June 16? across five venues. We show live odds for Polymarket-based markets (sourced from the Polygon order book); for other venues we list platform attributes, since the comparable contracts are not exposed via a public API on every venue. Every CTA points at Polymarket Tax UK — the application we operate, where you trade directly against the Polymarket order book at 0% fees.

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

Where can I trade this market with the lowest fees?

On Polymarket Tax UK, which mirrors the Polymarket order book at 0% fees. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

Is this market available outside the US?

Polymarket Tax 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.

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.