Highest temperature in London on August 4?

Platform comparison

Market context

London’s reading will be the **highest temperature at London City Airport Station** on 4 August, not the daytime maximum for the wider city, so a single warm spike in east London is enough to settle the market. London’s August climate is usually mild rather than hot: long-run guides put daytime highs around 21–22°C, with monthly averages near 73°F/23°C and regular rain events, while one August 2026 forecast for London City Airport points to highs in the low 20s°C rather than anything extreme.[1][3][4][8]

That makes the current 0% YES price hard to read as a statement on the weather itself and more as a reflection of the threshold the market is using. Comparable August forecasts for London in the supplied results range from about 21°C to 28°C, with some outlets calling for showery, overcast conditions and others still allowing a warm day in the high 20s.[5][10][13] Against that backdrop, the key question is whether the airport station gets a brief surge above the forecast band, rather than whether London has a broadly summery day.

Traders should watch the final morning and early afternoon updates for the airport station, because the market only needs the *highest* observed temperature before settlement at 12:00 UTC. The most relevant catalyst is any revision in the near-term forecast from warm and sunny to cloudier or wetter conditions, since recent London outlooks have already varied between low-20s°C, upper-20s°C and occasional shower risk.[5][10][16][17] London City Airport can also differ from central London by a degree or two, so small changes in wind, cloud cover or sea-breeze influence may matter more here than the broader city forecast.[1][3]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Sports-specific comparison page for Highest temperature in London on August 4?. 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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