Highest temperature in London on July 5?

Platform comparison

Market context

On 5 July 2026, London City Airport is set to experience the peak of a significant summer heatwave, with forecasts indicating temperatures could climb to 33°C in some parts of the city, making it the hottest day of the three-day burst from 3 to 5 July[2]. Current live observations at the airport show a high of 28°C with sunny intervals, aligning with the Met Office forecast for the day[3][7]. This immediate data contradicts the crowd-implied 0% probability for any outcome, as the market is clearly mispricing a near-certain extreme heat event.

Historically, July is the UK’s hottest month, with average highs around 22°C (72°F), but record-breaking days have pushed temperatures well above 37°C in Greater London, such as the 37.8°C recorded at Heathrow on 31 July 2020[8][10]. The current Polymarket data shows 29°C as the frontrunner at 47%, with 28°C at 39%, suggesting traders are already pricing in a high-temperature outcome despite the 0% signal on this specific platform[1]. The 0% figure appears to be a platform error or liquidity gap rather than a reflection of market sentiment.

Traders should monitor the official Wunderground resolution source for the final recorded maximum temperature at London City Airport, as the heatwave forecast predicts strong sunshine and very high UV levels with minimal overnight cooling[2]. The forecast explicitly states July 5th will be the hottest of the three days, with temperatures potentially reaching 33°C, which would place the outcome in the 32–33°C range if accurate[2]. No further announcements are needed; the weather pattern is already established, and the resolution depends solely on the final logged data point from the station.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Sports-specific comparison page for Highest temperature in London on July 5?. 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?

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