Highest temperature in London on July 14?

Platform comparison

Market context

On 14 July 2026, London City Airport's weather station will record a daily maximum temperature in Celsius. The market currently shows 0% probability across all temperature bands, reflecting either sparse liquidity or genuine uncertainty about which range will settle. Traders are pricing this as an open question with no consensus forecast, leaving room for those with conviction about summer heat patterns to establish positions before the settlement window closes at midday UTC.

Historical July temperatures at London City Airport provide the baseline for calibrating expectations. The station's records show July highs typically range between 20–25°C, with occasional peaks above 26°C during heat waves. The UK's record July temperature of 40.3°C (set in 2022) occurred elsewhere, but London has experienced 32–34°C days in recent summers. The 2022 heatwave and the 2019 summer both pushed London maxima into the high 20s and low 30s, establishing that whilst extreme heat is possible, it remains statistically less frequent than moderate warmth.

Traders should monitor the Met Office's seasonal outlook and medium-range forecasts as July 2026 approaches. Atmospheric patterns, jet stream positioning, and any Atlantic blocking systems will determine whether high pressure settles over the UK in mid-July. The UK Health Security Agency's heat-health alert system, typically activated when temperatures exceed thresholds, may signal elevated probabilities for higher temperature bands if issued. Real-time forecast updates from Wunderground itself will become increasingly reliable within 10 days of settlement, allowing late-stage position adjustments based on converging meteorological models.

Methodology

This page reviews Highest temperature in London on July 14? 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 PolyGram, 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

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'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.

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.