Highest temperature in London on June 24?

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Market context

The real-world event determining this market is the peak temperature recorded at London City Airport on 24 June 2026, with the crowd currently assigning a 76% probability that the reading will stay at or below 35°C. This implies traders expect Atlantic fronts or overnight cooling to cap the heat, despite the potential for a 38°C spike if conditions remain static[1].

Historical June maxima in London average near 21°C, yet recent days have seen significant deviations, with Hampstead recording 33.9°C on 23 June and Kew Gardens hitting 26.6°C earlier this year as the hottest day of 2026 so far[2][5][8]. The current 70% probability for the "35°C or below" band suggests the market is pricing in a return to more typical, albeit warm, June conditions rather than a record-breaking heatwave, contrasting with the 100% certainty seen for the 32°C cap on 23 June[1][3].

Traders should monitor the arrival schedule of Atlantic weather fronts and any official Met Office announcements regarding heat thresholds, as these are the primary catalysts that could shift the outcome from the current frontrunner to the 36°C band[1]. From an accessibility angle, German GlüStV regulations and US CFTC reach create a complex compliance landscape, yet the "no-KYC up to $1,500" threshold allows retail participants to access this specific weather market without immediate identity verification, provided they stay within the stipulated limit. This regulatory nuance remains a key factor for traders evaluating entry barriers in the current prediction market environment.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Highest temperature in London on June 24? 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 Tax 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 Polymarket Tax 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.

Is this market available outside the US?

Polymarket Tax UK 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 Tax UK?

Zero. Polymarket Tax 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.