Pronóstico: Highest temperature in London on July 21?

Platform comparison

Market context

London's highest temperature on 21 July 2026 will be measured at City Airport Station and resolved against historical weather records. The 1% crowd probability reflects expectation of a relatively cool day for mid-summer in the capital, suggesting traders anticipate temperatures below the range thresholds offered in the market.

London's July temperatures typically range between 18–24°C, with extremes rare. The UK Met Office records show that temperatures exceeding 30°C in London occur in roughly one in three July days during warm summers, whilst readings above 32°C happen in fewer than one in ten years. The 2022 heatwave saw London reach 40.3°C on 19 July, an anomaly driven by continental air masses. More representative recent Julys have peaked between 25–28°C. The current 1% probability suggests the market is pricing for a day closer to the cooler end of typical summer range, possibly reflecting early-season weather patterns or model consensus pointing away from high-pressure systems.

Traders should monitor the UK Met Office and BBC Weather forecasts from mid-July 2026, as these typically become reliable five to seven days before the event. Atlantic weather systems and the North Atlantic Oscillation phase will determine whether high pressure establishes over the UK or whether cooler, wetter conditions prevail. Any significant heat alerts issued by the Met Office in the week prior would signal shifting probabilities. Wunderground's historical data feed updates daily and remains the binding resolution source; cross-checking against nearby stations like Heathrow can verify outliers, though City Airport's riverside location occasionally produces marginally different readings.

Methodology

Football-specific comparison page for Pronóstico: Highest temperature in London on July 21?. 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 (US-focused) or Manifold (play-money).

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

Are prediction markets better than sports betting?

Prediction markets tend toward tighter odds than bookmakers because they use peer-to-peer exchange rather than bookmaker margin. On major matches, Polymarket quotes typically sit 2-5% closer to the true probability model than bet365 or DraftKings.

When do sports markets resolve?

Typically within hours of the official final whistle. Polymarket uses UMA Optimistic Oracle with source URLs pointing at official league data feeds — e.g. the Premier League for EPL markets, UEFA for Champions League, FIFA for World Cup.

Can I bet on individual matches?

Yes, Polymarket lists every major Premier League / Champions League / World Cup match as its own market. Liquidity varies — top matches like El Clásico or a semi-final often have six-figure pools, lower-league games closer to three-figure.

Which sports markets are available?

Football (soccer) dominates — Champions League, World Cup, Premier League, La Liga, Bundesliga — followed by NFL, NBA, tennis Grand Slams, Formula 1, boxing/MMA. Resolution via official league source confirmation.

How fast do sports winnings settle?

Once the official league outcome is logged in the UMA Oracle (typically 1-2 hours after the final whistle), Polymarket's smart contract triggers USDC payout. To your wallet within minutes.