Highest temperature in London on May 30?

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Market context

London's weather on 30 May 2026 will be measured against historical May temperatures recorded at City Airport, the official settlement station. Late May typically sees London transitioning into early summer conditions, with average highs around 19–21°C, though the range of possible outcomes remains wide this far ahead. The 0% crowd probability suggests traders are either awaiting clearer meteorological data or treating this as a placeholder market pending seasonal forecasts.

May temperatures in London have historically shown considerable variability. The past decade's May records at City Airport have ranged from highs of 26–28°C during warm spells to cooler days around 15–17°C when Atlantic systems dominate. The Met Office's long-range outlooks, typically issued 2–3 weeks before the target date, will be the critical reference point for traders reassessing probabilities. Current atmospheric patterns and sea surface temperatures in the North Atlantic will influence whether May 2026 trends toward above-normal or near-normal warmth.

The key catalyst will be the release of the Met Office's extended outlook for late May 2026, expected in early May. Traders should monitor broader European weather patterns through spring, particularly the North Atlantic Oscillation phase and sea surface temperature anomalies, which drive UK weather persistence. The settlement relies on Wunderground's historical data from EGLC (London City Airport), so familiarity with that station's recording methodology matters for interpreting edge cases around what constitutes the "highest temperature" on the day.

Methodology

This page is a comparison snapshot: one live quote (Polymarket), four reference venues with their key attributes, and a single execution path — every trade button routes to Prediction Today, which mirrors the Polymarket order book directly.

Resolution & payout

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FAQ

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How reliable are the quoted odds?

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