Pronóstico: Highest temperature in London on July 26?

Platform comparison

Market context

On 26 July 2026, London City Airport's weather station will record a daily high temperature, and this market resolves to whichever range bracket contains that figure. The 0% crowd probability suggests traders are pricing in either extreme confidence in a specific outcome or genuine uncertainty about which range will validate. Settlement hinges on Wunderground's historical data feed for that single station, making data availability and measurement integrity the technical resolution points rather than forecaster disagreement.

London's July temperatures have historically clustered between 20–28°C, with the city's record high of 40.3°C set in July 2022 representing an outlier driven by exceptional atmospheric conditions. The 2022 heatwave was preceded by weeks of sustained high pressure and drought conditions across northern Europe. More typical July highs at City Airport range from 22–26°C; readings above 30°C occur in roughly one in five years during summer months. This distributional history provides the baseline against which any single-day forecast should be calibrated.

The Met Office's seasonal outlook and Atlantic weather patterns through June 2026 will shape July's thermal regime, though single-day prediction remains inherently uncertain beyond two weeks. Traders should monitor early-July temperature trends and any high-pressure systems developing over the continent in the weeks prior to settlement. The specific station location—an urban airport environment—means microclimatic factors including tarmac heating and wind exposure can produce readings slightly above surrounding areas, a detail worth considering when evaluating range probabilities against broader London forecasts.

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

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

FAQ

Where can I trade this market with the lowest fees?

Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is Polymarket Qué Es. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Polymarket Qué Es 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.