Highest temperature in London on June 22?

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Market context

London City Airport is already in a notably warm June setup, with the Met Office showing a **27°C** daytime maximum for Monday and BBC Weather indicating a similar high of **28°C** at the airport station. That places the market in the top end of the likely daily range, especially when compared with the more ordinary mid-teens result seen on cooler early-June London days, such as the **17°C** call that fully dominated the June 6 market. [3][5][2]

The crowd’s 0% YES pricing on a broader “high temperature” framing would only make sense if the settlement band were well above the current forecast peak, but the live weather picture does not support that reading: current observations at London City Airport are already around the low 20s Celsius, while the official forecast keeps the day near the upper 20s rather than surging into the mid-30s. [3][6][9] For traders, the key catalysts are the next Met Office update, any shift in cloud cover or winds around the Thames corridor, and whether the airport’s afternoon peak lands a degree higher or lower than forecast, because that is what will decide whether the result sits in the **27°C** or **28°C** bracket. [3][5]

Historically, London City Airport in late June sits inside the warm-season window, with climate data showing June is already part of the sustained rise towards the summer peak, which makes high-20s outcomes more routine than exceptional. That backdrop matters because the market is not asking whether London is warm, but whether the station’s single highest reading on the day pushes into the next temperature bucket before the settlement window closes. [7][1]

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

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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.

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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?

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Do I need to KYC for this market?

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