Highest temperature in London on June 14?

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Market context

The settlement hinges on the single highest temperature reading at London City Airport on 14 June 2026, measured in Celsius. The crowd currently assigns zero probability to any outcome, suggesting either extreme uncertainty about the temperature range options or minimal trading activity. London's June temperatures typically range between 18–24°C, with occasional warm spells pushing into the upper 20s. Historical data from the Met Office shows that temperatures exceeding 28°C in mid-June occur roughly once every five to seven years in central London, whilst readings above 30°C remain rare events for this period.

The 0% implied probability warrants scrutiny against seasonal norms. June 2025 saw London experience a high of 26.3°C on the 14th, providing a recent comparable. The UK's climate trend shows gradual warming, with the past decade producing several June days in the 27–29°C band. Traders should monitor the European weather pattern forecasts released in early June 2026, particularly the position of high-pressure systems over the continent. The Met Office's extended outlook, typically issued 10–14 days ahead, will signal whether anomalous heat is developing. Any Atlantic blocking pattern or Saharan dust advection in early June could shift expectations materially, as these conditions have preceded London's warmest June days in recent years.

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 Who Will Win, 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

Where can I trade this market with the lowest fees?

On Who Will Win, 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?

Who Will Win 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.

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, Who Will Win 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.