Highest temperature in London on June 28?

Platform comparison

Market context

London City Airport is forecast to reach a maximum daytime temperature of 26°C on 28 June 2026, with sunny intervals and a moderate southerly breeze, directly contradicting the market’s current 0% probability assigned to any outcome above 14°C. Historical data shows London’s highest recorded temperature is 40.2°C at Heathrow and St James’s Park in July 2022, while June typically sees average highs around 21–23°C; recent years, including 2024, recorded 35.1°C in London during an extreme heat event, confirming that mid-summer temperatures frequently exceed 25°C. The current crowd-implied probability appears to misread seasonal norms, as June 28 falls squarely within the warm season (16 June to 8 September), when average daily highs exceed 67°F (19.4°C) and often climb higher.

Traders should monitor the Met Office’s daily 5:59pm update for London City Airport, which currently confirms a 26°C maximum, and watch for any sudden shifts in the southerly wind pattern or humidity levels that could push temperatures higher. Wunderground’s official resolution source will record the highest temperature for all times on 28 June, meaning even a brief spike in the afternoon could alter the outcome. No major weather warnings are currently active, but the Met Office has previously issued red extreme heat alerts when temperatures reached 35°C, suggesting that forecasters may revise upward if conditions intensify. The settlement window ends at 12:00 UTC on 28 June 2026, so real-time observations from the National Weather Service and BBC Weather will be critical for final validation.

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Methodology

Sports-specific comparison page for Highest temperature in London on June 28?. Polymarket's live quote (Polygon order book) plus platform attributes for the three reference venues. Sports markets reward liquidity — Polymarket and Betfair are materially deeper than Kalshi or Manifold.

Resolution & payout

Sports markets typically settle on official final-whistle plus league confirmation. Polymarket uses UMA Optimistic Oracle with a source URL per contract — usually official league data feeds or ESPN/Soccerway. Two-hour dispute window, then smart-contract payout in USDC.

FAQ

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Can I import form data and lineups?

This page shows the live Polymarket quote as an implied probability. Form data and lineups must be researched separately via sports data providers (e.g. Soccerway, ESPN, FBref) — we surface the market probability, not the sport analysis.