Highest temperature in London on July 5?

Platform comparison

Market context

The real-world event at hand is the peak temperature recorded on 5 July 2026 at London City Airport, a metric that will determine the resolution of a prediction market currently implying a 0% chance of hitting the 29°C threshold. With a wetter, windier pattern moving into southern England, forecasters expect temperatures to hover between 15°C and 19°C, making a 29°C spike highly improbable under current atmospheric conditions[3].

Historical data frames this low probability starkly: London’s highest ever observed temperature is 40.2°C, recorded on 19 July 2022, but typical July highs at City Airport rarely exceed 28°C even in sunny spells[1][2]. The current 0% implied probability aligns with analyst consensus that the incoming rain bands and gusty winds of 30–40 km/h will suppress any significant thermal rise, diverging from sportsbook lines that occasionally offer odds on extreme heat events despite similar weather warnings[3].

Traders should monitor the Met Office’s 7-day forecast updates and Wunderground’s hourly temperature logs for any sudden shifts in cloud cover or wind speed that might alter the thermal profile[5]. A recent weather alert confirms that steady showers and low clouds will persist through Friday morning, with temperatures capped at 20°C even if sun briefly appears[3]. No major announcements or schedule changes are expected to disrupt this pattern, reinforcing the market’s current stance that 29°C is effectively impossible under the prevailing conditions[3].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Highest temperature in London on July 5? across the five venues with material prediction-market liquidity. The probability shown is the live Polymarket mid; the comparison rows summarise how each venue treats the underlying contract — fees, KYC thresholds, settlement currency, deposit options. The highlighted row marks the cheapest route into Polymarket's order book.

Resolution & payout

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

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.

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 PolyGram 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.