Highest temperature in London on May 30?

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Market context

The settlement hinges on the highest temperature recorded at London City Airport on 30 May 2026, with the crowd currently pricing all temperature ranges at zero probability. This reflects the typical uncertainty surrounding specific daily weather outcomes more than six months ahead, where meteorological forecasting skill deteriorates sharply beyond two weeks.

May temperatures at London City Airport historically cluster in the 15–22°C range, with daily highs rarely exceeding 25°C. The station's 30-year average high for late May sits around 19°C. Extreme heat days above 28°C occur in roughly one year per decade during this period. The 0% crowd probability suggests traders are treating this as a pure lottery rather than anchoring to seasonal norms—a common pattern when resolution depends on precise instrumental readings rather than categorical outcomes.

The relevant catalysts are the Atlantic weather patterns that will dominate late May 2026. High-pressure systems tracking across the British Isles typically deliver the warmest days, whilst Atlantic lows bring cooler, wetter conditions. The UK Met Office's seasonal outlook, due in April 2026, will provide the first substantive signal on whether anomalous warmth is likely. Traders should monitor the North Atlantic Oscillation index and sea-surface temperature anomalies in the months preceding settlement, as these drive May's jet-stream positioning. The current zero-probability pricing leaves value across all temperature bands if historical frequency distributions are applied, particularly in the 19–22°C and 22–25°C ranges where May typically settles.

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 2026, 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 2026, 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 2026 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 does it cost to trade on Who Will Win 2026?

Zero. Who Will Win 2026 routes every order to the live Polymarket order book; the only cost is the Polygon network fee, typically under $0.01 per transaction.

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, Who Will Win 2026 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.