Highest temperature in London on May 27?

Platform comparison

Active sub-markets

Market context

London's highest temperature on 27 May 2026 will be recorded at City Airport and settled against Wunderground historical data. The settlement window closes at noon UTC on that date, meaning traders must commit capital before the morning's final readings are locked in. For UK-based traders using Klarna's buy-now-pay-later rails or direct SEPA transfers, deposit friction remains material; liquidity depth depends on how quickly funding clears before the resolution window narrows.

May temperatures in London have historically ranged between 12°C and 28°C over the past two decades, with median highs around 18–20°C. The 0% crowd probability suggests either extreme confidence in a specific temperature band or thin early-stage order flow. Comparable late-May weather markets show that seasonal forecasts become reliable only 10–14 days ahead; current positioning likely reflects uncertainty rather than conviction. Traders depositing via USDC or SEPA will face different settlement timelines, affecting whether they can react to updated meteorological models closer to the event date.

The UK Met Office publishes extended outlooks every Thursday; the May forecast update scheduled for early May 2026 will be the primary catalyst for repricing. Any Atlantic weather system tracking toward the British Isles in the preceding week could shift implied probabilities sharply. Withdrawal rails—whether SEPA redemption or Klarna's deferred payment schedule—should be verified before entry, as post-resolution liquidity can tighten if the market resolves to an unexpected range.

Methodology

This page reviews Highest temperature in London on May 27? across five venues. We show live odds for Polymarket-based markets (sourced from the Polygon order book); for other venues we list platform attributes, since the comparable contracts are not exposed via a public API on every venue. Every CTA points at Polymarket Klarna UK — the application we operate, where you trade directly against the Polymarket order book at 0% fees.

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 Polymarket Klarna UK?

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