Highest temperature in London on August 17?

Platform comparison

Market context

The market seeks to establish the highest temperature recorded at London City Airport on 17 August 2026, using Weather Underground's Daily Observations table as the authoritative source. The settlement window closes at midday on that date, meaning only observations recorded before 12:00 UTC will count toward resolution.

August temperatures at London City Airport typically range between 19°C and 24°C, with historical highs occasionally reaching 26–28°C during warm spells. The 0% crowd probability suggests traders are pricing in an expectation that the temperature will fall below the lowest threshold offered in the market's range options. This positioning appears cautious relative to August's typical weather patterns in London, where sustained heat waves do occur with measurable frequency. Between 2015 and 2024, August daily highs exceeded 25°C on multiple occasions at the airport station, indicating that moderate warmth is neither rare nor extreme for the month.

Traders should monitor long-range forecasts released in late July and early August, particularly from the UK Met Office and European weather models, which typically gain reliability 10–14 days ahead. Any significant Atlantic weather systems or high-pressure systems tracking toward the British Isles in mid-August could shift temperature expectations materially. The specific reliance on Weather Underground's Daily Observations table—rather than summary figures—means traders should familiarise themselves with how that source records intra-day temperature peaks, as station-specific recording protocols can occasionally differ from broader regional estimates.

Methodology

Sports-specific comparison page for Highest temperature in London on August 17?. 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%.