Highest temperature in London on July 21?

Platform comparison

Market context

The highest temperature recorded at London City Airport on 21 July 2026 will determine the resolution category for this market. The 1% crowd probability suggests traders expect a notably warm day, with the implied outcome sitting well above typical July conditions for the location.

London's July temperatures at City Airport typically peak between 20–24°C, with historical records showing that days exceeding 28°C occur infrequently. The UK's most extreme heat events—such as the July 2022 heatwave that saw temperatures reach 40.3°C in some regions—remain statistical outliers. City Airport, situated in east London near the Thames, experiences moderating effects from water proximity and urban infrastructure that generally suppress peak temperatures compared to inland locations. The current 1% probability reflects trader scepticism about an unusually hot outcome on that specific date.

Traders should monitor long-range weather forecasts as July 2026 approaches, particularly Atlantic pressure systems and any anticipated heat domes tracking northward from continental Europe in mid-to-late summer. The Met Office typically issues extended outlooks three to four weeks ahead, which will provide the first substantive signals about anomalous warmth potential. Real-time forecast updates in early July will sharpen expectations considerably. Settlement relies on Wunderground's historical data feed from the airport station, which records hourly observations; traders should verify the data source remains operational and consistent with previous years' reporting standards.

Methodology

Sports-specific comparison page for 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 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

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.

What are live sports odds on Polymarket?

Some top-tier matches stay open during play — you can trade the half-time probability in the 70th minute. Polymarket mid-prices update second-by-second; any frontend mirroring the order book shows the same movement.

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.