Highest temperature in London on July 15?

Platform comparison

Market context

London City Airport will record its peak temperature for 15 July 2026, with the outcome settling against specific Celsius ranges based on Wunderground data. The crowd currently assigns a 0% probability to the YES outcome, implying traders believe the event will not occur within the implied threshold, yet Polymarket data shows a strong divergence where "28°C" leads at 57% and "27°C" follows at 22%[1]. This split suggests the market is pricing a hot day despite the binary contract’s current zero-implied stance, creating a notable odds gap compared to platforms that might aggregate these range probabilities differently.

Historical July highs at EGLC often breach 27°C during heatwaves, with recent summers frequently hitting 28°C or higher, framing the 0% YES probability as potentially misaligned with seasonal norms[1]. Comparable cases from the last five years show London City Airport regularly exceeding 26°C in mid-July, meaning the current market pricing may underestimate the likelihood of a warm day unless a specific cold anomaly is forecast.

Traders should monitor the Met Office’s 72-hour forecast for the Thames region and any sudden shifts in southerly wind flow, which currently sits at 8 mph with 88% humidity[2]. A recent update from The Weather Network indicates temperatures hovering near 28°C with a 30% chance of precipitation, suggesting the catalyst for a resolution above 27°C remains active[3]. Watch for official Met Office announcements before the 12:00 UTC settlement window, as any deviation in wind direction or cloud cover could rapidly alter the final reading.

Sources: 1 · 2 · 3

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 PolyGram, 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.

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.

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.