Highest temperature in London on June 26?

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Market context

The real-world event driving this market is the recorded peak temperature at London City Airport on 26 June 2026, with current forecasts suggesting a maximum daytime temperature of 26°C under unsettled post-May conditions[1][6]. The crowd-implied probability of 0% for any outcome above the lowest range reflects a consensus that extreme heat is unlikely, aligning with the Met Office’s projection of a 26°C ceiling rather than the record-breaking highs seen in previous years[1][6].

Historically, London City Airport experiences its warm season from 16 June to 8 September, with average daily highs exceeding 67°F (approximately 19.4°C), yet June 2026 has not mirrored the exceptional heat of June 2025, when Heathrow reached 33.9°C—the hottest June day since 1976[4][7]. This disparity frames the current 0% probability as a rational assessment, given that recent weather patterns have remained moderate compared to the anomalous 35°C recorded at Kew Gardens in May 2025[5].

Traders should monitor upcoming Met Office updates and BBC Weather bulletins for any shifts in temperature forecasts, as these sources currently establish the 26°C daytime maximum[1][2]. While no scheduled political debates or campaign-finance disclosures directly influence weather outcomes, the market leans on the reliability of Wunderground as the resolution source, which will publish the definitive hourly data after the settlement window closes[1]. The primary catalyst remains the official temperature reading itself, with no external political events expected to alter the meteorological trajectory.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page tracks Highest temperature in London on June 26? across four political prediction venues. Live odds come from the Polymarket order book (the deepest political prediction-market book). Kalshi is the CFTC-regulated US alternative, Betfair the established UK sports-exchange with politics markets, Manifold the open play-money variant. Election Predictions UK routes every trade through to Polymarket — at 0% fees.

Resolution & payout

Political markets typically settle on official candidate or agency confirmation. Polymarket uses UMA Optimistic Oracle: a proposer posts the outcome with a bond, the two-hour window opens, then the smart contract pays USDC.

Kalshi settles USD via CFTC clearinghouse, with clearly defined resolution sources (e.g. AP race calls for elections). Betfair settles after the official outcome is registered with the league or agency. Manifold is play-money.

FAQ

Where can I trade this market with the lowest fees?

On Election Predictions 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?

Election Predictions 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.

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, Election Predictions UK triggers a quick verification flow that finishes in minutes.