Highest temperature in London on July 12?

Platform comparison

Market context

London City Airport is experiencing sunny intervals with a moderate southerly breeze today, 12 July 2026, as the settlement window for the highest temperature market closes at noon UTC. Current readings show a high of 29°C for the day so far, with no rain expected and humidity at 88% [4][5]. The crowd-implied probability of the market resolving to a specific high-temperature range is 0% YES, suggesting consensus that the threshold in question is unlikely to be met.

Historically, July is London’s hottest month, with an average high of 22°C (72°F) at London City Airport, though extremes have occurred [2]. In July 2022, parts of London recorded over 40°C for the first time, with Heathrow and St James’s Park hitting 40.2°C [7]. However, London City Airport, being more exposed to the Thames and urban cooling, typically records lower peaks than western stations. The 0% probability likely reflects this station-specific tempering effect and the current day’s moderate conditions.

Traders should monitor the Met Office’s 7-day forecast updates and Wunderground’s historical daily records for EGLC as the final confirmation source [3]. With today’s high already at 29°C and no heatwave warnings issued, the value may lie in contrarian positions if a late-day spike occurs, though the 12:00 UTC settlement cutoff limits exposure to afternoon surges [5]. No major weather announcements are scheduled, and dependencies remain tied strictly to observed maxima at EGLC.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page is a comparison snapshot: one live quote, four reference venues with their key attributes, and a single execution path — every trade button routes to Who Will Win 2026, which mirrors the Polymarket order book directly.

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

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 Who Will Win 2026. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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 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 Who Will Win 2026 trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.