Highest temperature in London on July 10?

Platform comparison

Market context

The real-world event in question is the peak temperature recorded at London City Airport on 10 July 2026, a date that historically sits within the UK’s hottest month. Current crowd-implied probability for any specific high-temperature range is 0% YES, suggesting the market sees no credible chance of an extreme outlier, despite July averaging a high of 72°F (22°C) at this station[1].

Historical precedent frames this probability carefully: the third week of July 2025 saw a brief but intense heatwave across the British Isles, with some airports recording 40°C for the first time in English history[7][10]. However, London City Airport typically remains cooler than inland hubs, and current forecasts for 10 July 2026 predict a high of 86°F (30°C) with mostly sunny conditions and very warm temperatures[3][5]. This divergence between the 2025 extreme and the 2026 forecast explains the market’s conservative stance.

Traders should monitor the Met Office’s 7-day forecast updates and Wunderground’s hourly data as the settlement window approaches, particularly for any sudden shifts in wind direction or cloud cover that could elevate temperatures[2][6]. The south-easterly breeze currently in place at 10 mph is a key dependency; a shift to southerly flow could push temperatures higher, as seen in the 2022 heatwave[5]. No major announcements are scheduled, but real-time sensor data from the airport will be the definitive catalyst for resolution.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page is a comparison snapshot: one live quote, four reference venues with their key attributes, and a single execution path — every trade button routes to PolyGram, which mirrors the Polymarket order book directly.

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.