Highest temperature in London on June 25?

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Market context

On 25 June 2026, London City Airport will record its peak temperature for the day, a single data point that determines whether this prediction market resolves to the highest temperature range. The current crowd-implied probability of 1% for a "YES" outcome suggests traders believe the temperature will fall outside the specific range being bet on, likely due to the station’s recent exposure to extreme heat. Historical context frames this low probability: London has just endured a record-breaking heatwave, with temperatures soaring to 40°C in the capital over the preceding days, as reported by the Standard [3]. The Met Office confirmed Wednesday’s high reached 37°C and Thursday’s peaked at 31°C at London City Airport, while Hampstead recorded 33.9°C on 23 June [1][7]. Such sustained highs make a deviation from the expected range statistically rare, aligning with the 1% market signal.

A programmatically minded trader would approach this market by monitoring real-time Wunderground feeds for the EGLC station, setting conditional orders to trigger if the temperature breaches the threshold before 12:00 UTC. Key catalysts include the Met Office’s extended amber alert for extreme heat, which remains active until the end of Thursday, indicating continued thermal pressure [3]. Traders should also watch for scheduled weather model updates from the National Weather Service, which could refine forecasts for the settlement window [4]. With the heatwave expected to drop to 29°C by Friday, the narrow window for 25 June becomes critical; any sudden shift in wind patterns or cloud cover could alter the peak temperature. The convergence of these dependencies—alert extensions, model revisions, and the station’s proximity to the heatwave’s core—defines the risk profile for this market.

Sources: 1 · 2 · 3 · 4 · 5

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 Polymarket Review UK, 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?

Polymarket Review 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.

How does resolution work?

Through the UMA Optimistic Oracle on Polygon: a proposer submits the outcome, a two-hour challenge window opens, and USDC payouts settle automatically once the result is final.

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 Review UK?

Zero. Polymarket Review 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 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.