Highest temperature in London on May 28?

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Active sub-markets

Market context

The settlement hinges on the peak temperature recorded at London City Airport on 28 May 2026, with resolution sourced from Weather Underground's historical data for that specific station. The 0% crowd probability suggests traders are either absent from this market or treating it as a placeholder ahead of spring forecasting season.

London's late May temperatures typically range between 18–23°C, with extremes rare but not unprecedented. The station's historical record for May shows occasional peaks near 27–28°C during warm spells, though sustained heat above 25°C remains the exception rather than the rule for this period. The 2022 May heatwave pushed readings into the mid-20s across southern England, providing a recent benchmark for what elevated but plausible conditions look like. Current market pricing at zero suggests either thin liquidity or genuine scepticism that any single day will breach higher temperature thresholds, leaving potential value in moderate-range outcomes if spring 2026 tracking shows an early warm pattern developing.

Traders should monitor the UK Met Office's seasonal outlook for spring 2026 and any Atlantic blocking patterns that typically drive sustained warmth into late May. The North Atlantic Oscillation index and sea surface temperature anomalies in March and April will signal whether conditions favour above-normal temperatures. Weather forecasts become actionable only in the final week before settlement, but longer-range pattern signals from February onwards will determine whether this market remains dormant or attracts genuine interest as the date approaches.

Methodology

This page reviews Highest temperature in London on May 28? 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 Who Will Win 2026 — the application we operate, where you trade directly against the Polymarket order book at 0% fees.

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

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 Who Will Win 2026?

Zero. Who Will Win 2026 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, Who Will Win 2026 triggers a quick verification flow that finishes in 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.