Highest temperature in London on July 15?

Platform comparison

Market context

On 15 July 2026, the real-world event determining this market is the highest temperature recorded at London City Airport, measured in degrees Celsius. In prediction markets, a YES share pays out if the temperature falls within the specific range the market asks about, while a NO share pays out if it does not. Here, the crowd currently implies a 0% chance that the temperature will hit the asked range, suggesting traders expect a cooler day than the threshold requires.

Historical July highs at London City Airport typically range between 20°C and 32°C, with extreme heatwaves pushing readings toward 35°C or higher, as seen during the 2022 and 2023 summer peaks. The current 0% probability implies the market expects temperatures well below the threshold in question, possibly aligning with average mid-July conditions rather than record-breaking heat. Comparable cases show that while London can experience sudden spikes, sustained extreme heat is less common than in southern Europe, making low probabilities plausible unless a specific heat event is forecast.

Traders should monitor daily forecasts from the Met Office and real-time updates from Wunderground, the official resolution source, for any sudden shifts in temperature predictions. A key catalyst is the arrival of southerly winds, which can transport warmer air from continental Europe, as currently noted in live data showing southerly flow at 8 mph [2]. No major announcements are scheduled, but weather models update frequently, and any revision predicting a heat dome over the UK could rapidly alter the implied probability before the settlement window closes at 12:00 UTC on 15 July 2026.

Sources: 1 · 2 · 3

Methodology

This page reviews Highest temperature in London on July 15? 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 Prediction Market 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.

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.

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.

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.