Highest temperature in London on July 15?

Platform comparison

Market context

London City Airport will record its peak temperature for 15 July 2026, with the market resolving to the Celsius range containing that figure. The crowd currently assigns a 0% implied probability to the YES outcome, signalling near-total consensus that the temperature will not fall within the specific range being traded. This extreme pricing mirrors historical mid-July patterns at EGLC, where temperatures typically exceed 25°C, making lower ranges statistically improbable under normal summer conditions.

Comparable cases from the last decade show London City Airport frequently hitting 28–32°C on 15 July, with only rare outliers dipping below 20°C during unseasonal cool spells. The 0% price suggests the market treats the offered range as an underdog with no realistic chance of hitting, akin to betting on a frost event in summer. Value, if any, would lie in contrarian positions only if a sudden atmospheric shift—such as a deep Atlantic low—were confirmed, though no such signal is present.

Traders should monitor the Met Office’s daily UK weather summary and Wunderground’s live EGLC feed for real-time temperature updates, as these are the primary catalysts for settlement. A recent Met Office bulletin notes stable high-pressure conditions over southern England through mid-July, reinforcing the consensus view [1]. With settlement closing at 12:00 UTC today, the window for new information is narrow, and the market’s pricing already reflects the prevailing forecast of warm, dry conditions.

Sources: 1

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

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.

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.

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.