Highest temperature in London on May 27?

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Market context

London's highest temperature on 27 May 2026 will be measured at City Airport Station and resolved against historical weather data from Wunderground. The settlement window closes at midday UTC, capturing the peak temperature recorded across the full calendar day at that specific location.

Late May in London typically sees maximum temperatures between 18–22°C, though the range can extend from 15°C on cooler days to 26°C during warm spells. The 0% crowd probability suggests traders are pricing in an expectation that the day will fall within a particular temperature band—likely the most common historical outcome for this date. May 27 data from previous years shows variability; some years record highs in the low 20s whilst others remain in the mid-to-high teens depending on Atlantic weather systems and high-pressure positioning over the UK.

Traders should monitor the Met Office extended forecast from mid-May onwards, as synoptic patterns 10–14 days ahead will clarify whether continental warm air or Atlantic low-pressure systems dominate the period. The North Atlantic Oscillation phase and jet-stream positioning in late May typically determine whether anomalous warmth reaches southern England or whether cooler, wetter conditions prevail. Any significant warming event across Europe in the weeks prior would shift probability towards higher temperature bands, whilst persistent westerly flow would anchor expectations towards seasonal norms.

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 Champions League Prediction — the application we operate, where you trade directly against the Polymarket order book at 0% fees.

Resolution & payout

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

FAQ

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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.