Highest temperature in London on May 26?

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Active sub-markets

Market context

London's highest temperature on 26 May 2026 will be recorded at City Airport and settled against Wunderground historical data. The settlement window closes at midday, capturing the peak daily reading. Current odds reflect minimal trading activity, typical for weather markets more than eighteen months out where deposit friction and limited liquidity constrain early positioning. Traders accessing this market through SEPA transfers or Klarna instalments often wait until nearer the event date when atmospheric models converge and book depth improves, reducing slippage on entry and exit.

Historical May temperatures in London range between 12°C and 28°C, with the median high around 19–21°C. The 2022 heatwave pushed readings to 27°C in late May; 2020 saw a cooler May averaging 16°C highs. These precedents anchor reasonable expectations within the 16–24°C bands, though outlier scenarios (sub-10°C or above 28°C) remain possible. Early traders pricing this market typically reference Met Office seasonal outlooks and long-range ensemble forecasts, which become actionable only in April or May when deposit rails and withdrawal options (USDC on-chain, UK bank transfers) see higher throughput.

The UK Met Office publishes monthly climate summaries in early June, and the Environment Agency issues May weather reviews that traders use for post-event validation. Spring 2026 Atlantic pressure patterns and North Atlantic Oscillation indices will be the primary catalysts shaping May's thermal profile. Traders should monitor March–April forecast updates; book depth typically accelerates in the final two weeks as payment friction diminishes and confidence in weather models hardens.

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

Where can I trade this market with the lowest fees?

On Polymarket Deposit UK, which mirrors the Polymarket order book at 0% fees. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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 Deposit UK?

Zero. Polymarket Deposit UK 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, Polymarket Deposit UK triggers a quick verification flow that finishes in minutes.