Pronóstico: Highest temperature in London on July 13?

Platform comparison

Market context

London City Airport is forecast to reach a high of 27°C today, yet the Polymarket contract betting on a specific temperature range containing the day’s peak currently prices the “YES” outcome at just 2% [2][4]. Traders on Polygon are using USDC to buy conditional tokens, and the market’s heavy weighting on the 27°C and 28°C outcomes suggests the crowd expects the temperature to stay within that narrow band rather than spike dramatically [2]. The settlement window closes at 12:00 UTC on 13 July 2026, with Wunderground serving as the definitive resolution source for the highest recorded temperature at EGLC [2].

Historically, July is London’s hottest month, averaging a high of 72°F (22°C), but extreme outliers have occurred, such as the 40.2°C record set at Heathrow in July 2022 [1][5]. The current 2% probability implies the market views a significant heat spike above the forecast as unlikely, aligning with typical July variability where temperatures rarely breach 30°C at City Airport [2]. While the 2022 record stands as the city’s absolute peak, local conditions at EGLC often remain cooler than Heathrow due to its riverside, urban location [5].

Traders should monitor real-time updates from the Met Office and BBC Weather, which currently list a high of 27°C with sunny conditions and a moderate southerly breeze [4][7]. Any sudden shift in wind direction or cloud cover could alter the peak temperature, but the forecast remains stable with no precipitation expected [8]. Since the market resolves only after Wunderground publishes the first data point for the date, liquidity may remain thin until official confirmation, making early position adjustments dependent on live sensor readings rather than speculative announcements [2].

Sources: 1 · 2 · 3 · 4 · 5

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

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.