Highest temperature in London on July 26?

Platform comparison

Market context

The Met Office will record the highest temperature at London City Airport on 26 July 2026, with settlement determined by Wunderground's historical weather data for that specific station. The 0% crowd-implied probability reflects the market's current inability to assess a future weather outcome with meaningful confidence, rather than a genuine expectation of unseasonable cold. This represents a typical pattern for long-dated weather markets where traders lack sufficient atmospheric data to form differentiated views.

London's July temperatures have historically clustered between 20–25°C, with extremes reaching 28–30°C during heatwaves. The summer of 2022 saw the UK record 40.3°C, though London City Airport recorded 37.1°C that day. July 2023 peaked at 27.8°C in the capital. These precedents suggest most traders are anchoring expectations around the 22–28°C range, though the market's zero probability indicates minimal trading activity rather than consensus on the likely outcome. Comparable weather markets on other dates show similar liquidity patterns until approximately 10–14 days before settlement.

Traders should monitor the Met Office's seasonal outlook and any issued heatwave alerts in early July 2026, as these typically trigger repricing in weather derivatives. The UK Health Security Agency issues heat-health alerts when temperatures are forecast to exceed thresholds, which historically correlate with market movement. Atmospheric patterns from late June will provide the first material signal; traders currently have no actionable catalyst, explaining the market's dormancy.

Methodology

This page reviews Highest temperature in London on July 26? 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

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.

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.