Highest temperature in London on July 24?

Platform comparison

Market context

London’s official high for 24 July at City Airport will be set by the day’s maximum observed temperature, with the contract resolving on the Wunderground history page for EGLC. At the open on 24 July, the crowd-implied probability is **0% YES**, which usually indicates either very thin liquidity or a market that has been priced as effectively out of reach rather than a settled meteorological forecast.

That zero pricing sits in contrast to the normal London July climate, where the city’s average high is about **23.2°C** and average rainfall is modest but frequent, so most years cluster in the low-to-mid 20s rather than anything extreme.[1] For comparison, recent London heatwaves have pushed daytime highs into the low-to-mid 30s, with the BBC reporting forecasts around **33–35°C** during a July heat spell and Met Office-linked coverage describing London at **34°C** earlier in the month.[2][4] That backdrop matters because a 0% market price is far below even a conservative seasonal expectation, implying the contract is being treated as a near-impossibility by traders rather than merely a cool-day outcome.

The main catalysts are the evolving Met Office forecast for London, any UKHSA heat-health alerts, and how late-day sea-breeze or convective effects affect London City Airport specifically, since the settlement source is the station’s recorded maximum rather than a citywide average. The key cross-platform comparison is whether sportsbook-style weather pricing, if available, aligns with prediction-market pessimism or whether the market is simply illiquid; with no live sportsbook line supplied here, the most relevant signal is that analyst and meteorological context still points to meaningful summer heat variance, but not to a guaranteed extreme.

Sources: 1 · 2 · 3 · 4

Methodology

This page reviews Highest temperature in London on July 24? 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 Best Prediction Markets UK, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

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.

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.

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.

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 Best Prediction Markets UK trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.