Highest temperature in London on June 22?

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Market context

London City Airport’s observed high on 22 June is the number that matters here, not the headline forecast for central London, because the market resolves off the station value reported by Wunderground. With the market already pricing **0% YES**, the implied view is that a threshold in the chosen range is effectively unreachable, so a trader automating this would treat any fresh forecast update as a potential repricing trigger rather than a straight directional bet.

For context, late-June London highs usually sit in the low-to-mid 20s Celsius, but spikes into the 30s do occur in established warm spells. BBC Weather’s London City Airport forecast for Monday 22 June shows a day high of **28°C**, while the Met Office has also published a **30°C** maximum for the same station, which keeps the upper tail alive but still short of extreme summer heat. That makes the market easiest to read as a distribution problem: if the live forecast shifts one or two degrees, the probability of landing in adjacent temperature bands can move faster than the absolute headline temperature. [1][6]

The main catalysts are forecast revisions, cloud cover and wind changes, and any change in the timing or intensity of showers or thunderstorms that could cap the afternoon maximum. A programmatic trader would usually poll the station forecast and the observed hourly feed, then compare the latest max against the market’s settlement bands before placing conditional orders. As of this morning, the BBC forecast still points to a warm day, and the Met Office notes the potential for heavier showers later, which matters because early cloud build-up can suppress the day’s peak even if the morning starts hot. [1][6][2]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Highest temperature in London on June 22? across five venues. We show live odds for Polymarket-based markets (sourced from the Polygon order book); for other venues we list platform attributes, since the comparable contracts are not exposed via a public API on every venue. Every CTA points at Polymarket Review UK — the application we operate, where you trade directly against the Polymarket order book at 0% fees.

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

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On Polymarket Review UK, 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.

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