Highest temperature in London on August 14?

Platform comparison

Market context

On 14 August 2026, the highest temperature recorded at London City Airport will determine this market's settlement. The contract currently trades at 0% implied probability, suggesting traders expect the eventual high to fall outside whatever range this particular contract covers—most likely because the specific temperature bracket hasn't been disclosed in accessible terms, or because the range sits at an extreme end of plausible outcomes for mid-August in London. Settlement hinges on Weather Underground's Daily Observations table for the airport station, not the summary Day High & Low figures, a distinction that matters when automated systems and manual readings occasionally diverge.

Historical August temperatures at London City Airport cluster between 20–26°C for daily highs, with occasional excursions toward 28–30°C during heat waves. The summer of 2022 saw the UK's record-breaking temperatures, yet even then London's August highs rarely exceeded 32°C. Current climate patterns and seasonal forecasting models suggest August 2026 will track within normal ranges, though the Met Office's long-range outlooks remain uncertain at this distance. Traders should monitor whether this contract's temperature range aligns with meteorological norms or targets an outlier scenario.

The UK's weather forecasting community typically issues reliable 10–14 day outlooks by early August, with confidence improving sharply in the final week before settlement. Any unusual atmospheric patterns—Atlantic blocking highs, tropical moisture intrusions, or jet stream repositioning—would surface in professional forecasts by mid-month. The settlement window closes at midday UTC on 14 August, allowing only morning observations to count; traders should verify whether Weather Underground updates its Daily Observations table in real time or with a lag.

Methodology

We track Highest temperature in London on August 14? across the five venues with material prediction-market liquidity. The probability shown is the live Polymarket mid; the comparison rows summarise how each venue treats the underlying contract — fees, KYC thresholds, settlement currency, deposit options. The highlighted row marks the cheapest route into Polymarket's order book.

Resolution & payout

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

FAQ

Is this market available outside the US?

Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

How does resolution work?

Through the UMA Optimistic Oracle on Polygon: a proposer submits the outcome, a two-hour challenge window opens, and USDC payouts settle automatically once the result is final.

What's the difference between YES and NO shares?

A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like PolyGram trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.

How reliable are the quoted odds?

The YES/NO percentages are the live mid-prices of the Polymarket order book. On deep markets they move every few seconds; on thinner ones you'll see short plateaus.