Highest temperature in London on June 7?

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Active sub-markets

Market context

The market seeks the highest temperature recorded at London City Airport on 7 June 2026. The crowd currently assigns zero probability across all temperature ranges, suggesting either insufficient liquidity or genuine uncertainty about which bracket will resolve. London's June temperatures typically range from 15°C to 23°C, though heat waves can push readings above 25°C. The settlement hinges on a single daily maximum from Wunderground's historical data for that specific station.

Historical precedent shows London experiences considerable variability in early June. The Met Office records indicate June highs have ranged from 18°C in cooler years to 28°C during anomalous warm spells. The 2022 heatwave saw June temperatures exceed 30°C, though such extremes remain statistical outliers. A zero-probability reading across all brackets suggests traders may be waiting for seasonal forecasts closer to the date, or the market lacks sufficient participation to establish meaningful odds. This creates potential value for those willing to stake positions on likely ranges—mid-20s readings align with long-term June averages, whilst sub-18°C or above-27°C outcomes represent genuine tail risks.

Traders should monitor the UK Met Office's long-range forecasts released in May 2026, which typically provide confidence intervals for temperature anomalies. Atlantic pressure patterns and any developing heat domes over continental Europe will signal whether June 7 falls within a warm or cool spell. The resolution window closes at noon UTC, meaning only morning and early-afternoon readings count; this timing advantage favours those familiar with London's typical diurnal temperature curve, where peaks occur mid-afternoon.

Methodology

We track Highest temperature in London on June 7? on the five venues with material liquidity for prediction markets. Live odds come from the Polymarket Polygon order book — the only source that ships real-time data under an open licence. For Kalshi, Betfair and Manifold we list platform attributes (fee, KYC, settlement, payment) instead of fabricated odds, because their APIs use non-comparable contract definitions.

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

Is this market available outside the US?

Who Will Win 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 Who Will Win?

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

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, Who Will Win triggers a quick verification flow that finishes in minutes.