Highest temperature in London on June 4?

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Market context

The London City Airport weather station will record its highest temperature on 4 June 2026, with settlement determined by Wunderground's historical data for that specific location and date. The market currently shows zero probability assigned to any temperature range, suggesting either early-stage pricing or data unavailability for June 2026 forecasts.

London's June temperatures typically range between 18°C and 23°C, though heat waves can push readings into the high 20s. The 2022 heatwave saw June peaks exceed 32°C across southern England, whilst more typical recent Junes have maxima around 20–22°C. Historical volatility in early summer weather means the settlement range will depend heavily on whether high-pressure systems dominate or Atlantic weather systems bring cooler, unsettled conditions. The City Airport station, located in East London near the Thames, may record slightly different readings than central London due to its proximity to water and urban heat island effects.

Traders should monitor long-range weather models from mid-May onwards, as these become more reliable within the two-week window before 4 June. The Met Office and European Centre for Medium-Range Weather Forecasts typically issue extended outlooks in late May that provide directional guidance on whether the month will trend warmer or cooler than climatological norms. Any significant Atlantic blocking pattern or continental high-pressure system developing in early June would shift probabilities towards higher temperature ranges, whilst unsettled westerly flow would favour cooler outcomes.

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 Champions League Prediction, which mirrors the Polymarket order book directly.

Resolution & payout

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

FAQ

Where can I trade this market with the lowest fees?

On Champions League Prediction, which mirrors the Polymarket order book at 0% fees. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

Is this market available outside the US?

Champions League Prediction 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.

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.