Highest temperature in London on June 26?

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Market context

The real-world event hinges on the highest temperature recorded at London City Airport on 26 June 2026, a single-day metric that will determine the market’s resolution range. Current crowd-implied probability sits at 0% for the “YES” outcome, suggesting traders believe the temperature will fall outside the specified range, though this figure must be weighed against recent heat anomalies in the region.

Historical precedents frame this probability cautiously: earlier in June 2026, Kew Gardens in southwest London reached 26.6°C, marking the hottest day of the year so far according to the Met Office[3][7]. Meanwhile, NW3 Weather recorded a maximum of 35.7°C on 24 June at a nearby station, indicating that extreme heat is not unprecedented in late June London[6]. These cases suggest that a 0% probability may be overly dismissive if the weather pattern continues its upward trend.

Traders should monitor the Met Office’s daily forecasts and Wunderground’s live updates for London City Airport, as sudden shifts in cloud cover or wind direction can alter peak temperatures within hours[4]. The settlement window closes at 12:00 UTC on 26 June, meaning any late-morning heat spike could invalidate the current consensus. Additionally, regulatory frameworks like Germany’s GlüStV and the US CFTC’s reach may affect market accessibility, particularly for platforms offering “no-KYC up to $1,500” tiers, which could broaden participation despite compliance hurdles.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page is a comparison snapshot: one live quote (Polymarket), 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?

PolyGram is available in most jurisdictions where Polymarket isn't directly accessible. Polymarket itself is geo-blocked in the US/UK/EU. Always check local regulations.

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 it cost to trade on PolyGram?

Zero. PolyGram routes every order to the live Polymarket order book; the only cost is the Polygon network fee, typically under $0.01 per transaction.

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.