Highest temperature in London on July 10?

Platform comparison

Market context

On 10 July 2026, London City Airport will record its peak temperature for the day, a single data point that determines the outcome of a prediction market where the crowd currently assigns zero probability to any temperature exceeding the highest defined range. This stark divergence between the 0% implied probability and the physical reality of July as London’s hottest month—averaging 23°C highs at this airport—suggests a potential mispricing, as historical data confirms July routinely delivers temperatures well within the upper brackets of such contracts[1].

Historical precedents frame this zero probability as highly anomalous; during the intense heatwave of the third week of July 2025, UK airports recorded unprecedented extremes, with some hitting 40°C for the first time in English history, proving that July temperatures can easily breach standard thresholds[7][10]. Even in more typical years, recent daily reports show maximums reaching 34.2°C on 8 July 2026, while current forecasts for 10 July predict a high of 86°F (approximately 30°C), indicating that the weather system remains conducive to high temperatures rather than the cold snap implied by the market[3][5].

Traders should monitor the immediate Met Office 7-day forecast and Wunderground hourly updates for any shifts in cloud cover or wind direction that could elevate the peak temperature, as these are the primary catalysts for range resolution[2][6]. With the settlement window closing at 12:00 UTC on 10 July, the lack of any significant cooling trend in the current forecast—showing mostly sunny and very warm conditions with minimal precipitation—further undermines the rationale for a 0% YES probability, creating a clear opportunity for cross-platform odds comparison against more realistic sportsbook lines[3][4].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page is a comparison snapshot: one live quote, four reference venues with their key attributes, and a single execution path — every trade button routes to Best Prediction Markets UK, which mirrors the Polymarket order book directly.

Resolution & payout

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

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.