Highest temperature in London on August 19?

Platform comparison

Market context

On 19 August 2026, the highest temperature recorded at London City Airport will determine which range this market resolves to, with settlement based on the Daily Observations table from Weather Underground rather than summary figures. The airport station provides a consistent measurement point across London's urban area, capturing conditions that reflect the city's typical summer weather patterns.

August temperatures in London have historically ranged between 20°C and 28°C, with extremes occasionally reaching into the low 30s during heat waves. The 0% crowd probability suggests traders are pricing in either exceptionally cool conditions or uncertainty about the specific resolution mechanics. Historical August data from the Met Office shows that temperatures above 25°C occur in roughly two-thirds of years, whilst readings above 30°C remain relatively uncommon, occurring perhaps once every five to seven years. The 2022 heat wave that pushed London to 40.3°C was exceptional; more typical hot Augusts peak between 26°C and 29°C.

Traders should monitor the European summer weather pattern forecasts as August 2026 approaches, particularly Atlantic pressure systems and any developing heat domes over continental Europe. The North Atlantic Oscillation index and jet stream positioning in late July will provide early signals about whether high pressure systems might deliver sustained warmth into mid-August. Weather Underground's historical accuracy and the specific reliance on the Daily Observations table—rather than rounded summary highs—means traders need clarity on whether the resolution source will capture sub-degree precision or round to whole numbers.

Methodology

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

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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.

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