Pronóstico: Highest temperature in London on August 12?

Platform comparison

Market context

On 12 August 2026, the highest temperature recorded at London City Airport will fall into one of several defined ranges, measured in degrees Celsius via the Daily Observations table on Weather Underground. The market currently prices all temperature outcomes at 0% YES across available brackets, reflecting the settlement window's distance and the inherent uncertainty in forecasting a specific day's peak temperature nearly two years forward. USDC positions on Polygon will resolve conditionally based on which range captures the actual recorded high, with the Daily Observations data taking precedence over any summary figures that might appear elsewhere on the platform.

August temperatures at London City Airport typically range between 20–24°C, though heat waves can push readings into the upper 20s or low 30s. The summer of 2022 saw the UK record 40.3°C at Coningsby, whilst August 2023 remained cooler, with London peaks around 26–28°C. These historical bands provide calibration points for assessing what constitutes an unusually warm versus typical August day in the capital, though climate variability means any single year's outcome sits within a broad distribution.

Traders monitoring this contract should track seasonal weather pattern forecasts released in summer 2026, particularly from the Met Office and European forecasting services, which typically gain accuracy within two to three weeks of the target date. Atlantic pressure systems and jet stream positioning in early August will determine whether continental heat advection reaches the UK or whether cooler maritime air dominates. The specific choice of London City Airport as the measurement station—rather than Heathrow or other major sites—means local microclimatic factors and urban heat effects at that location will ultimately govern settlement, making historical data from that precise station more relevant than broader London averages.

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

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.

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.

What does Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

How fast are USDC deposits?

Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within minutes.

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.