Highest temperature in London on June 13?

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Market context

London's highest temperature on 13 June 2026 will be measured at City Airport Station and resolved against historical weather data from Wunderground. The settlement window closes at midday on the day itself, meaning traders are forecasting peak afternoon conditions during early summer in south-east England.

June temperatures at London City Airport typically range between 20–25°C, with occasional peaks above 26°C during warm spells. Historical records show that exceeding 28°C on a single June day occurs roughly once every three to four years in the capital, whilst readings above 30°C remain rare events confined to exceptional heatwaves. The 0% crowd probability suggests traders are pricing in a scenario where the temperature falls within a lower range bracket—likely below 20°C or within the 20–23°C band—reflecting typical early-summer conditions rather than anomalous heat.

The key variable is whether a high-pressure system or Atlantic weather front dominates the south-east on that date. Traders should monitor Met Office forecasts from late May onwards, particularly any warnings of sustained warmth or unsettled conditions. Cloud cover, wind direction from continental Europe, and overnight lows all influence daytime maxima. The specific measurement point at City Airport—situated on the Thames estuary with maritime influence—typically records slightly cooler readings than inland London locations, which may anchor expectations toward the lower end of the June range.

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). The odds column is filled only where we have clean data — that avoids the made-up numbers that get a network demoted when search engines cross-check against the source venue.

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?

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.

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.

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, Champions League Prediction triggers a quick verification flow that finishes in minutes.