Highest temperature in London on May 26?

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Market context

London's highest temperature on 26 May 2026 will be measured at City Airport and resolved against historical weather records from Wunderground. The settlement window closes at midday, capturing the full diurnal cycle for that date. Late May in London typically sees mean highs between 19–21°C, though extremes have reached 28–29°C in recent decades during early summer heat events.

The 0% crowd probability reflects genuine uncertainty rather than consensus that a specific temperature band is impossible. May weather in south-east England remains volatile; the month has produced both cool, wet spells and sudden warm spells driven by continental air masses. The 2022 heatwave saw temperatures exceed 30°C in parts of the UK by late May, whilst 2021 and 2023 saw more subdued conditions. Resolution depends entirely on Wunderground's historical data feed for EGLC station, which updates once daily observations are finalised—typically within 24 hours of the settlement window.

Traders funding positions via Klarna or SEPA transfers should note that book depth on weather markets correlates with deposit velocity; shallow liquidity on niche temperature ranges often reflects friction in on-ramp flows rather than genuine disagreement on outcomes. USDC deposits clear faster and unlock tighter spreads on adjacent temperature bands. The market's traction will depend on whether traders can efficiently move capital into position before the event window closes, making payment rail speed a material factor in range selection and hedge timing.

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

Is this market available outside the US?

PolyGram 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 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.

Do I need to KYC for this market?

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