Highest temperature in London on June 26?

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Active sub-markets

Market context

London City Airport is forecast to reach a maximum daytime temperature of 26°C on 26 June 2026, under unsettled post-May conditions with high humidity and falling pressure[2][6]. This real-world baseline frames the current market probability of 0% YES for any outcome above this threshold, as authoritative sources like the Met Office and BBC Weather confirm tight clustering around this value[1][6]. Historically, early June in London typically sees highs near 17°C following a heatwave, though recent records show spikes to 33.5°C at Heathrow in June 2026, making it the hottest June day since 1976[5][7]. The consensus firmly backs the 26°C outcome, leaving minimal spread in projections, while a contrarian angle would require unforecasted cloud clearance or warmer air advection—both highly unlikely given current model runs[1].

Traders should monitor the Met Office’s daily updates for any sudden shifts in wind direction or pressure, as southerly winds at 8 mph and 88% humidity currently suppress rapid temperature rises[2]. The settlement window ends at 12:00 UTC, so any late-morning announcements regarding atmospheric clearance could alter the trajectory, though ensemble models suggest stability[1]. Recent news from the Met Office confirms 33.9°C at Heathrow as a record, but London City Airport’s location and current muggy conditions make a similar spike improbable[7]. Value may sit in underdog positions if a rapid clearance of cloud cover occurs, but current data makes substantial deviation before resolution highly unlikely[1]. The implied probability of 0% reflects this high-confidence guidance, with the frontrunner outcome locked at 26°C[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

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

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'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 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.

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, Who Will Win 2026 triggers a quick verification flow that finishes in minutes.