Highest temperature in London on June 11?

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Market context

On 11 June 2026, London City Airport's weather station will record a daily maximum temperature in Celsius. The market currently prices all outcome ranges at 0%, reflecting the settlement window's distance and the absence of actionable meteorological data. Polymarket traders holding USDC on Polygon will select from discrete temperature bands, with conditional tokens settling against Wunderground's historical records for that specific date and location. The airport station provides a consistent urban measurement point, though its readings typically run 1–2°C warmer than central London due to tarmac and infrastructure effects.

June temperatures in London have historically ranged between 15°C and 28°C, with the 30-year average high around 21°C. The UK's warmest June day on record (29.1°C in 1976) remains an outlier; more typical warm June days peak between 23–26°C. Recent Junes have shown increasing variability, with 2022 recording 32.2°C in parts of England during an exceptional heatwave, though London City Airport's readings remained more moderate. Current probability distribution suggests traders expect a conventional range rather than extreme heat.

Catalysts for market repricing will emerge as June 2026 approaches. The Met Office's seasonal outlook, typically issued monthly, will provide guidance on atmospheric patterns and jet stream positioning by late May. Real-time weather models become reliable only 10–14 days before the event, meaning significant probability shifts should occur in early June. Any Atlantic blocking patterns or continental heat advection flagged in medium-range forecasts will drive conditional token prices upward for higher temperature bands.

Methodology

We track Highest temperature in London on June 11? on the five venues with material liquidity for prediction markets. Live odds come from the Polymarket Polygon order book — the only source that ships real-time data under an open licence. For Kalshi, Betfair and Manifold we list platform attributes (fee, KYC, settlement, payment) instead of fabricated odds, because their APIs use non-comparable contract definitions.

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 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.

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.

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.

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, Polymarket UK triggers a quick verification flow that finishes in 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.