Highest temperature in London on July 31?

Platform comparison

Market context

London’s late-July heat profile makes a very high reading possible, but only in a genuine hot spell. The city’s benchmark extremes are well established: Heathrow reached 37.8C on 31 July 2020, and London’s all-time high is 40.2C, set at Heathrow and St James’s Park on 19 July 2022.[2][17] Against that backdrop, a market priced at 0% YES is effectively saying the day is not expected to produce an exceptional London heat event, and the historical record suggests that anything in the high 30s is a rare outcome rather than a baseline July result.[3][12]

For traders, the key catalysts are any late heatwave forecasts, especially if high pressure becomes established over southern England in the run-up to the day, because that is when London can move sharply towards the upper end of its July range.[2][17] In a more typical London July, average daily maxima are in the low-to-mid 20s Celsius, which leaves little room for the kind of spike needed to challenge the historical extreme.[7][18] The main dependency is therefore not sport-style form or absences, but the evolution of the weather pattern and whether forecasters start signalling 30C-plus conditions at short notice; if they do, the market can reprice quickly even from a very low starting point.[5][11]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Sports-specific comparison page for Highest temperature in London on July 31?. 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

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.

What's the difference between match odds and outright odds?

Match odds cover a single game ("Bayern beats BVB"). Outright odds are long-term aggregates ("Bayern wins the league"). Outright markets have deeper liquidity; match markets have faster resolution.