Highest temperature in London on June 8?

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Active sub-markets

Market context

The highest temperature recorded at London City Airport on 8 June 2026 will determine which temperature band resolves this market. Historical data from the Met Office shows that early June in London typically sees maximum temperatures between 18–22°C, though the airport station—situated on the Thames estuary—can register slightly cooler readings than central London due to proximity to water and maritime influence. The 0% crowd probability suggests traders are pricing in either extreme confidence in a specific temperature range or uncertainty about which band the market offers; without visibility of the available resolution brackets, the current odds reflect either a consensus view or thin liquidity.

June weather in the south-east of England remains subject to Atlantic weather systems and occasional high-pressure ridges from continental Europe. The UK Met Office and BBC Weather will publish extended forecasts from early June onwards, with particular attention to any heat warnings or unseasonal warm spells in the week leading up to 8 June. Traders should monitor whether any persistent anticyclonic patterns develop over northern Europe in late May, as these can drive temperatures above the seasonal norm. The settlement window closes at midday on the day itself, so real-time temperature readings from Wunderground's London City Airport station will be the decisive factor; any overnight or early-morning data will not count towards the resolution.

Methodology

We track Highest temperature in London on June 8? 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

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

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 Champions League Prediction?

Zero. Champions League Prediction 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.