Highest temperature in London on June 19?

Platform comparison

Active sub-markets

Market context

London City Airport is already in a warm spell, with current observations around 30°C and BBC and Met Office forecasts showing a hot Friday for the station before conditions ease into Saturday. The market resolves from the highest temperature recorded at London City Airport on 19 June, so the relevant risk is not the headline city forecast alone but whether the airport station actually posts a late-afternoon peak high enough to land in a higher bracket. [2][3][8]

A 0% implied probability for any positive outcome suggests the crowd is leaning heavily against a sufficiently extreme reading, but the reference point should be the station’s own daily range rather than London-wide averages. WeatherSpark describes the site’s warm season as running from mid-June through early September, which supports the idea that mid-June highs can already be elevated, while the NOAA/METAR feed shows London City Airport reached 30°C on 19 June by midday last year, illustrating that this date can produce a meaningful daytime peak. [5][7]

Traders should watch the final daytime forecast updates, because the settlement source is the airport station history page rather than a general city forecast, and the market cannot resolve until the first data point for 19 June 2026 is published there. Any change in cloud cover, sea breeze, or shower timing over the afternoon can move the eventual high by a degree or two, and the live airport observations and hourly forecast are the most useful inputs as the day unfolds. [1][2][8]

Sources: 1 · 2 · 3 · 4 · 5

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

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?

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.