Highest temperature in London on May 30?

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Market context

London's highest temperature on 30 May 2026 will be measured at City Airport Station and resolved against historical weather data from Wunderground. Late May in London typically sees maximum temperatures between 18–22°C, though anomalies occur. The settlement window closes at midday, meaning only temperatures recorded up to that point count toward resolution.

Historical May weather at London City Airport shows a 30-year mean high of around 19°C, with the station recording extremes ranging from 11°C in cooler years to 26°C during warmer spells. The 0% crowd probability suggests traders are pricing in either a specific temperature threshold being unlikely or uncertainty about which bracket the day will fall into. May 2026 forecasts remain unavailable at present, but seasonal patterns indicate late spring typically avoids the sustained heat needed for readings above 25°C, making higher temperature bands statistically less probable than moderate ranges.

Traders should monitor UK Met Office forecasts as May 2026 approaches, particularly any early-season heatwave warnings or Atlantic weather systems that could drive temperatures upward. Bank holidays and weekend scheduling occasionally influence local microclimates near the airport, though this effect is marginal. The specific resolution source—Wunderground's historical data for EGLC station—is publicly accessible and updates daily, eliminating ambiguity around measurement methodology or location variance that sometimes complicates weather markets.

Methodology

This page reviews Highest temperature in London on May 30? 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 Champions League Prediction — 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

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 Champions League Prediction?

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

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, Champions League Prediction 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.