Highest temperature in London on May 30?

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Market context

On 30 May 2026, the highest temperature recorded at London City Airport will determine which range this market resolves to, with settlement occurring at midday. The 0% crowd-implied probability suggests traders are not backing any specific temperature band, indicating either genuine uncertainty about the outcome or insufficient liquidity to establish meaningful odds across the available brackets.

London's late May temperatures typically fall between 18–24°C, with historical records showing the airport station rarely exceeds 25°C during this period. The Met Office's 30-year climate averages for Greater London in late May centre around 20°C, though the city has experienced anomalous warmth in recent years—May 2022 saw temperatures reach 28°C across parts of the capital. Comparable prediction markets on UK weather have shown that when crowd probability sits at zero, the actual distribution often reflects genuine difficulty in forecasting rather than consensus around a particular range.

Traders should monitor the Atlantic weather pattern developing through April and May 2026, particularly the position of the jet stream and any high-pressure systems tracking towards the British Isles. The UK Met Office's monthly outlook, typically released mid-April, will provide the first formal seasonal signal for May conditions. Short-range forecasts from the Met Office and European Centre for Medium-Range Weather Forecasts become actionable only in the final week before settlement, at which point traders can cross-reference implied probabilities against model consensus on the specific day's maximum temperature.

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 Best Prediction Markets UK — 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 Best Prediction Markets UK, 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.

What does it cost to trade on Best Prediction Markets UK?

Zero. Best Prediction Markets UK 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, Best Prediction Markets 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.