Highest temperature in London on August 11?

Platform comparison

Market context

The market seeks to establish the highest temperature recorded at London City Airport on 11 August 2026, measured in degrees Celsius and sourced from Weather Underground's Daily Observations table rather than summary figures. The settlement window closes at midday UTC on that date, meaning the resolution will capture the peak temperature reached during the morning hours and any early afternoon spike before the cutoff.

London's August temperatures have historically ranged between 20–28°C, with extremes occasionally reaching 30°C or beyond during heatwaves. The 0% crowd probability suggests traders expect a relatively cool day or are pricing in uncertainty around the specific measurement methodology. August 2026 falls within the typical summer season when high-pressure systems can drive temperatures upward, though the precise conditions remain unknowable at this distance. Comparable August days at London City Airport show considerable variability; the station's exposed location near the Thames can produce readings that differ from central London observations.

Traders should monitor long-range weather forecasts as August 2026 approaches, particularly any signals of Atlantic high-pressure systems or continental warm air masses affecting the UK. The Met Office and European weather models typically show useful guidance 10–14 days before the event. The specific resolution source—Weather Underground's Daily Observations rather than headline figures—creates a technical dependency; discrepancies between different reporting standards have occasionally affected similar markets. Any significant weather pattern shifts or anomalies flagged by meteorologists in July 2026 will be material to reassessing probabilities.

Methodology

Sports-specific comparison page for Highest temperature in London on August 11?. 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.

UK Frequently Asked Questions

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.

Is Polymarket legal in the UK?

Polymarket is accessible to UK traders but is not UKGC-licensed. It operates under US CFTC jurisdiction. UK residents face no domestic legal prohibition on using it, but UKGC consumer protections do not apply. For UKGC-regulated alternatives, Betfair Exchange and Smarkets offer similar prediction-style markets.

Do I pay tax on prediction market profits in the UK?

UKGC-licensed platform profits (Betfair, Smarkets) are typically tax-free gambling winnings for UK individuals. Polymarket profits involve USDC crypto transactions, which HMRC treats as Capital Gains Tax events. Keep full transaction records and report via Self Assessment if gains exceed £3,000 per tax year.

How do I deposit on Polymarket from the UK?

UK traders typically fund Polymarket via Coinbase UK, Kraken or Revolut — buying USDC with GBP and transferring to a Polygon-compatible wallet (MetaMask, Coinbase Wallet). Polymarket's onboarding walks you through the bridging process. Typical GBP-to-USDC conversion costs 0.5–1%.