Highest temperature in London on June 27?

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Market context

The underlying event is the highest temperature recorded at London City Airport on 27 June 2026, measured in degrees Celsius and sourced from Wunderground. With a crowd-implied probability of 0% for the YES outcome, the market currently suggests the temperature will fall outside the defined range, likely reflecting expectations of cooler conditions or a range mismatch rather than a prediction of extreme cold.

Historical context frames this probability: the UK has provisionally seen a new maximum June temperature of 37.3°C at Santon Downham in Suffolk for three consecutive days, yet London City Airport typically records lower highs, with recent observations showing 26.6°C at Kew Gardens as the hottest day of 2026 so far[1][7]. Comparable cases show that while regional heatwaves occur, London’s airport station often stays below 30°C in June, making a 0% probability plausible if the range assumes higher thresholds.

Traders should monitor the Met Office’s daily forecasts for the Greater London area, particularly any announcements on heatwave classifications or temperature advisories, as these directly influence settlement[1]. The settlement window ends 2026-06-27T12:00:00Z, and dependencies include Wunderground’s data availability and the Met Office’s provisional record confirmations. Recent news from the Met Office confirms the third-day record streak, which may signal sustained heat, but local London conditions remain the decisive factor[10].

From a regulatory perspective, German GlüStV implications and US CFTC reach affect market accessibility, though “no-KYC up to $1,500” allows traders to participate without identity verification for this specific weather market, enhancing accessibility while maintaining compliance with brand-legal standards for polymarket-kyc.co.uk.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Highest temperature in London on June 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 Polymarket KYC UK — 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

Where can I trade this market with the lowest fees?

On Polymarket KYC UK, which mirrors the Polymarket order book at 0% fees. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

Is this market available outside the US?

Polymarket KYC 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.

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'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.

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.