Highest temperature in London on May 26?

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Market context

On 26 May 2026, the highest temperature recorded at London City Airport will fall into one of several defined ranges. The settlement mechanism relies on Wunderground's historical weather data for that specific station, with the resolution window closing at midday UTC. For algorithmic traders, this creates a straightforward data-feed dependency: the market outcome hinges entirely on a single numeric value pulled from a third-party weather archive, making it suitable for conditional order logic that triggers once Wunderground publishes its finalised daily maximum.

London's May temperatures typically range between 15°C and 22°C, though the city has recorded highs of 27°C in late May during anomalously warm years. The 0% crowd probability suggests either extreme confidence in cooler conditions or insufficient liquidity to establish meaningful price discovery. Historical precedent matters here: May 2022 saw London reach 24°C mid-month, whilst May 2020 peaked at 26°C. Traders evaluating this market should cross-reference seasonal patterns from the Met Office's 30-year climate normals rather than relying on single-year outliers.

The key variable is Atlantic weather systems in late May 2026. High-pressure systems tracking northward from the Azores typically drive warmer continental air into southern England, whilst low-pressure systems from the northwest suppress temperatures. Monitoring the European medium-range forecast from around 20 May onwards will signal which pattern dominates. The settlement window's noon UTC closure means afternoon heating is fully captured, favouring slightly higher temperature bands compared to markets closing at dawn.

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 PolyGram?

Zero. PolyGram 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.