Highest temperature in London on June 25?

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Market context

The real-world event hinges on whether London City Airport records a daytime maximum near 35°C on 25 June 2026, amid an ongoing UK heatwave driven by persistent high pressure. Recent Met Office forecasts suggest this peak is plausible, yet the crowd-implied probability for the specific outcome sits at a mere 1% YES, marking it as the clear underdog in a market where consensus heavily favours the 30°C to 32°C range. Historical data shows London’s warm season typically peaks above 67°F, with the absolute record reaching 40.2°C in July 2022, but ensemble models indicate a moderate spread that could cap readings if an Atlantic front arrives, explaining why the market clusters tightly around 31°C as the frontrunner [1][2][9].

Traders should monitor the timing of any incoming Atlantic fronts or cloud cover, as these are the primary catalysts that could suppress the peak temperature below the 35°C threshold required for the 1% outcome to hit. The current market pricing reflects a tight clustering between 31°C and 32°C, leaving the 35°C target as a contrarian angle with potential value if the heatwave persists without interruption [1]. While no specific weather announcements have been issued yet, the dependency on cloud cover remains critical; if the sky clears completely, the 35°C mark becomes a realistic value spot, whereas any cloud intrusion would reinforce the consensus view of a lower maximum [1].

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 Who Will Win 2026, 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?

Who Will Win 2026 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 does it cost to trade on Who Will Win 2026?

Zero. Who Will Win 2026 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.

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.