Highest temperature in London on July 19?

Platform comparison

Market context

London City Airport will record its peak temperature for 19 July 2026, the single data point determining settlement for this weather market. The current crowd-implied probability of 0% for a YES outcome suggests traders believe no specific high-temperature threshold is being tested, yet Polymarket data shows the frontrunner outcome is 21°C at 100% probability, indicating the market has effectively locked in a moderate summer day rather than a heatwave event [1]. This 100% assignment to 21°C contrasts sharply with the 0% for 19°C or below, framing the consensus around a typical mid-July London temperature rather than extreme conditions.

Historical July temperatures at London City Airport rarely exceed 25°C, with 21°C representing a plausible upper-mid range for a standard summer day without significant heat advection. The current pricing implies traders are discounting the likelihood of a record-breaking heat event, aligning with recent patterns where London’s airport station records moderate highs even during warm spells. The 0% probability for extreme outcomes reflects a market expectation that atmospheric conditions will not support temperatures significantly above the 21°C consensus.

Traders should monitor the Met Office’s weekly forecast updates for the London area, particularly any announcements regarding southerly wind shifts or high-pressure systems that could elevate temperatures beyond the 21°C baseline. Wunderground’s historical daily data for EGLC will serve as the definitive resolution source, so real-time temperature readings from 19 July morning through afternoon will be critical [1]. Any sudden shift in the Met Office’s outlook for the settlement window could rapidly alter the implied probability distribution, though current signals suggest stability around the 21°C outcome.

Sources: 1 · 2

Methodology

Football-specific comparison page for Highest temperature in London on July 19?. 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

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.

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.

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.