Highest temperature in London on June 17?

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Market context

On 17 June 2026, the highest temperature recorded at London City Airport will determine which range this market settles into. The settlement uses Wunderground historical data for the station, which sits in east London and captures conditions across the urban area rather than a rural or airport-wide average.

London's June temperatures typically range between 18°C and 24°C, though heat waves can push readings into the high 20s or low 30s. The Met Office records show that temperatures above 28°C on mid-June dates occur roughly once every five to seven years in the capital, whilst readings exceeding 32°C remain rare events in June—the last occurrence was 2022 when the UK experienced exceptional heat. Historical precedent suggests the crowd's 0% probability on extreme highs reflects realistic constraints: sustained continental air masses that drive such temperatures are uncommon in mid-June, and Atlantic systems typically moderate conditions during this period.

Traders should monitor the European weather pattern in early June 2026, particularly whether high-pressure systems establish over the continent and persist through mid-month. The UK's Met Office and BBC Weather forecasts, typically issued five to ten days ahead, will provide the clearest signals about whether warm air masses are tracking northward. Jet stream positioning and any blocking patterns that trap warm air over the British Isles would be the primary catalyst for movement away from the lower temperature ranges. Conversely, Atlantic low-pressure systems or unsettled conditions would reinforce cooler outcomes.

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 Sport Prediction, 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

Is this market available outside the US?

Sport Prediction 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 Sport Prediction?

Zero. Sport 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, Sport Prediction triggers a quick verification flow that finishes in minutes.