Highest temperature in London on May 28?

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Market context

London's highest temperature on 28 May 2026 will be measured at City Airport Station and resolved against historical weather data from Wunderground. The settlement window closes at midday on that date, capturing the peak temperature recorded across the full calendar day at this central London location.

May temperatures at London City Airport typically range between 15–22°C, with historical highs occasionally reaching 25–27°C during warm spells. The 0% crowd probability suggests traders are either uncertain about the specific temperature bands available in this market or are hedging against unseasonably cool conditions. Late May sits at the transition between spring and early summer, when London experiences variable weather patterns influenced by Atlantic systems and occasional continental warmth. Comparable years show that temperatures above 20°C occur in roughly 60% of May days, whilst readings exceeding 25°C are less frequent but not exceptional.

Traders should monitor the extended forecast from the UK Met Office and European weather models as May 2026 approaches, particularly tracking high-pressure systems that could drive temperatures upward. Jet stream positioning in late spring often determines whether warm continental air reaches the British Isles or whether cooler Atlantic patterns dominate. Any significant weather warnings or anomalies flagged by meteorological services in the weeks leading up to 28 May will shift expectations around the likely temperature range, though short-range forecasts remain unreliable beyond ten days.

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). The odds column is filled only where we have clean data — that avoids the made-up numbers that get a network demoted when search engines cross-check against the source venue.

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

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 Champions League Prediction?

Zero. Champions League 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.

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.