Highest temperature in London on June 26?

Platform comparison

Active sub-markets

Market context

The real-world event hinges on the peak temperature recorded at London City Airport on 26 June 2026, a metric that will determine the market resolution. Current crowd-implied probability sits at 0% for the highest temperature range, suggesting traders expect conditions to remain well below the threshold in question. This stance aligns with historical patterns where late June in London typically sees highs around 26°C, as confirmed by today’s Met Office forecast for London City Airport [4].

Historical data frames this probability sharply: the hottest June day in the UK since 1976 reached 33.9°C at Heathrow, not London City Airport, and even that extreme was an outlier [5]. London City Airport’s warm season averages daily highs above 67°F (24.4°C), with the hottest month rarely exceeding 30°C [3]. A recent spike of 35.7°C was recorded at NW3 on 24 June 2026, but this was a local anomaly, not reflective of the airport station’s typical behaviour [9].

Traders should monitor the Met Office’s hourly updates and Wunderground’s live feed for any sudden shifts in temperature trends, as these are the primary dependencies for settlement [2]. The settlement window ends at 12:00 UTC on 26 June, meaning only data up to that point counts. Recent news from BBC Weather confirms current conditions at London City Airport are 26°C maximum with southerly winds and 88% humidity, indicating stable, non-extreme weather [1]. Programmatically, conditional orders should trigger only if Wunderground’s real-time data breaches the target range before the deadline.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Highest temperature in London on June 26? across five venues. We show live odds for Polymarket-based markets (sourced from the Polygon order book); for other venues we list platform attributes, since the comparable contracts are not exposed via a public API on every venue. Every CTA points at Polymarket App UK — the application we operate, where you trade directly against the Polymarket order book at 0% fees.

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 App UK 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.

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 it cost to trade on Polymarket App UK?

Zero. Polymarket App UK 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.