Highest temperature in London on June 26?

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Market context

London City Airport is currently experiencing a sharp drop in temperature and rising cloud cover, with the Met Office forecasting a maximum of just 26°C for today, a significant retreat from the 37°C peak recorded at Heathrow earlier in the week[2][10]. This rapid cooling over the last 24 hours has driven the crowd-implied probability for a high-temperature outcome to 0%, as the immediate atmospheric conditions now favour a cool, unsettled day rather than a heatwave. The shift from intense sunshine to rainy intervals and falling pressure has effectively erased any market expectation of extreme warmth for the remainder of the settlement window[3].

Historically, late June in London often sees temperatures hovering between 25°C and 28°C, with the warm season typically beginning around June 16 and lasting until early September[6]. While records show peaks reaching 36°C or higher on exceptionally hot days, the current 0% probability aligns more closely with the typical, cooler variability seen after a sudden post-peak May, where unsettled conditions frequently suppress daytime highs[1]. The market is correctly framing this event not as an outlier heat day, but as a return to the standard, moderate thermal range for this period.

Traders should monitor the Met Office’s hourly updates for any sudden shifts in wind direction or cloud dissipation, as these are the primary catalysts that could alter the final temperature reading[2]. The National Weather Service chart for EGLC indicates a falling pressure trend and high humidity, which are strong dependencies for maintaining lower maximums[5]. With no major heat announcements scheduled and the current weather pattern firmly established, the focus remains on these real-time dependencies rather than speculative forecasts, confirming the low probability of a high-temperature settlement.

Sources: 1 · 2 · 3 · 4 · 5

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

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FAQ

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