Highest temperature in London on August 7?

Platform comparison

Market context

London is set to post a warm August day, with forecasts clustering around the mid-20s Celsius and some models pushing the upper 20s, which keeps the market comfortably in double-digit territory rather than near any cool-range outcome. AccuWeather’s August outlook for London shows highs mostly between 67°F and 78°F, while reporting for Friday 7 August points to about 26°C and sunny intervals across the capital.[1][4]

The current **0% YES** price is hard to square with the seasonal setup: early August in London often produces highs in the low-to-mid 20s, and this year has already seen a number of warm spells in the UK, including 26.6°C at Kew Gardens earlier in the summer.[13][8] The key comparable for traders is not the headline “day high” summary, but the highest value actually logged in the station’s daily observations table, so even a brief late-morning or afternoon spike at London City Airport can matter more than the rounded forecast range suggests.[3]

The main catalyst is whether the warm spell verifies at the station level on the day, since London’s coastal and urban microclimates can produce small but market-relevant differences between forecast and observed maxima. The most relevant signals are updated Met Office or local reporting on the day’s heat pattern, plus the Weather Underground daily observations page for London City Airport, which is the settlement source; if the broader forecast firms up to 26–28°C, the market should be read as sensitive to a one-degree move rather than a broad temperature regime shift.[9][14][3]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Sports-specific comparison page for Highest temperature in London on August 7?. 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.

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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.

UK Frequently Asked Questions

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