Pronóstico: Highest temperature in London on July 9?

Platform comparison

Market context

The highest temperature recorded at London City Airport on 9 July 2026 is currently priced at 0% YES for the 33°C–34°C range, reflecting a market consensus that the day’s peak will fall outside this bracket despite the ongoing heatwave. On-chain, this contract trades on Polygon using USDC, where conditional tokens lock liquidity against the Wunderground resolution source, which will publish the daily high once the first data point for 10 July is available.

Historically, London’s July peaks in recent heatwaves have consistently exceeded 32°C, with the Met Office recording 34°C on 7 July 2026 and forecasting Thursday 9 July as the week’s hottest day at 33°C between 4pm and 7pm[5]. Yet the 0% probability suggests traders anticipate a sharp drop due to incoming thunderstorms late on 8 July, which could suppress the daily high below 33°C despite earlier soaring temperatures[4].

Traders should monitor the UK Health Security Agency’s amber heat alert, active from 9am Wednesday 8 July until 9pm Sunday 12 July, and watch for real-time updates on storm development, as forecast models predict heavy rain and lightning arriving late on 8 July and continuing into 9 July[5][4]. The key dependency is whether the thunderstorms disrupt the afternoon heat peak; if they arrive before 4pm, the 33°C threshold may not be reached, validating the current 0% pricing.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Pronóstico: Highest temperature in London on July 9? across five venues. The live probability is the Polymarket mid-price, sourced directly from the on-chain Polygon order book; the comparison columns benchmark each venue on fee structure, KYC, settlement currency and payment rails. Every CTA routes to Polymarket Qué Es, which mirrors the Polymarket order book at 0% fees.

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.

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.

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.