Pronóstico: Highest temperature in London on July 12?

Platform comparison

Market context

London City Airport is currently experiencing sunny intervals with a moderate southerly breeze, pushing temperatures toward 83°F (28°C) on this Sunday, 12 July 2026. The prediction market for the highest temperature recorded today on the Polymarket platform shows a stark divergence between the live weather and the crowd-implied probability of 0% for any specific "YES" outcome, despite the frontrunner outcome of 28°C commanding a 49% to 56% probability share depending on the snapshot [2]. This contract, settled in USDC on the Polygon network via conditional tokens, resolves strictly on the Wunderground daily high for EGLC, meaning the on-chain price reflects a market betting against the current sunny conditions reaching the specific threshold required for a payout, or perhaps mispricing the immediate heatwave.

Historical data for London City Airport frames July as the hottest month, with an average high of 72°F (22°C), yet recent days in July 2026 have already shattered norms with a maximum of 31.2°C recorded on 10 July [4][7]. The current forecast for the month suggests daily highs ranging from 71°F to 87°F (22°C to 31°C), indicating that a 28°C peak is well within the expected variance for a heatwave period rather than an anomaly [1]. Traders should note that the 0% probability cited for the "YES" outcome likely stems from a misunderstanding of the market's binary structure or a specific threshold mismatch, as the live conditions align closely with the 28°C frontrunner outcome [2].

The primary catalyst for settlement is the final Wunderground data point for EGLC, which will be published after the 12:00 UTC settlement window closes. A powerful heatwave is currently spreading across southern England, a development highlighted in recent coverage of the London Heatwave July 2026, which suggests temperatures could sustain or exceed the 28°C threshold [9]. Traders monitoring the on-chain mechanics must watch the Met Office seven-day forecast for any sudden shifts in wind or cloud cover that could suppress the daily high before the resolution source updates [3]. The dependency on a single data point from Wunderground means the market will remain volatile until the official record is locked in.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Pronóstico: Highest temperature in London on July 12? 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.

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 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.

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.