Highest temperature in London on May 15?

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Market context

On 15 May 2026, the highest temperature recorded at London City Airport will determine which range this market resolves to. The settlement window closes at noon UTC that day, using historical data from Wunderground's archive for the airport station. Polymarket currently prices all temperature ranges at 0% YES, reflecting either extreme illiquidity or a technical issue with the market's conditional token structure on Polygon—traders should verify USDC balances and contract deployment before committing capital.

London's May temperatures typically peak between 18°C and 22°C, with historical highs occasionally reaching 25°C during warm springs. The 2022 heatwave saw mid-May temperatures exceed 20°C across the south-east, whilst cooler years have remained below 18°C. The 0% pricing suggests the market may lack sufficient liquidity to establish meaningful odds, or the range brackets themselves may be misaligned with typical May conditions at the airport station—a location that often records slightly cooler readings than central London due to proximity to the Thames estuary.

Traders should monitor the UK Met Office's extended forecast as May approaches, particularly any signals of high-pressure systems or Atlantic weather patterns that could drive unseasonably warm conditions. The airport station's specific microclimate—influenced by water bodies and urban heat distribution—can diverge from broader London forecasts. Settlement depends entirely on Wunderground's historical database accuracy; any discrepancies between the airport's instruments and the platform's recorded figures could delay or complicate resolution.

Methodology

This page reviews Highest temperature in London on May 15? 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 Scam? — 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 Scam?, 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 Scam? 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.

What does it cost to trade on Polymarket Scam??

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

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.