Highest temperature in London on May 27?

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Market context

The settlement of this contract hinges on the highest temperature recorded at London City Airport on 27 May 2026, measured in degrees Celsius. The market currently shows zero implied probability across the entire range, suggesting either insufficient liquidity or a technical issue with crowd pricing. Resolution will draw from Wunderground's historical weather database for that specific station, with the settlement window closing at midday UTC on the resolution date itself.

London's late May temperatures typically range between 15°C and 22°C, though anomalies occur regularly. The 27 May 2024 high reached 20°C at the same station; the previous year saw 19°C. Extreme outliers—temperatures exceeding 25°C in late May—occur roughly once per decade in London's recent climate record. The 0% crowd probability suggests traders may be awaiting clearer range definitions or historical baseline data before committing capital, a common pattern in weather markets with narrow settlement windows.

The UK Met Office publishes extended forecasts approximately two weeks ahead of the target date, with meaningful updates arriving in the final week of May 2026. Traders should monitor late-spring weather pattern shifts across the Atlantic, as high-pressure systems tracking from continental Europe drive the most significant temperature spikes in this period. Any forecast consensus for a warm spell or heatwave alert would likely shift market probabilities sharply toward higher temperature ranges. The settlement window's noon cutoff means afternoon temperature peaks will be captured, favouring warmer outcomes compared to morning-only measurements.

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

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

FAQ

Is this market available outside the US?

Best Prediction Markets UK 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.

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 Best Prediction Markets UK?

Zero. Best Prediction Markets 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, Best Prediction Markets UK triggers a quick verification flow that finishes in minutes.