Highest temperature in London on June 22?

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Active sub-markets

Market context

London City Airport’s high on 22 June is trading as a **favourite 27°C** in the market, with the crowd putting that outcome at **81%** and **28°C** as the main underdog at **19%**.[1] For handicappers, that leaves the consensus clearly skewed to the lower of the two quoted bands, and the implied pricing says traders are treating a mid-to-upper 20s result as the baseline rather than a genuine heat event.[1]

That looks broadly consistent with the day’s forecast backdrop: BBC Weather shows **28°C** for Monday 22 June at London City Airport, while the Met Office forecast also points to a **30°C** maximum, implying a warm but not extreme finish to the day.[2][5] The key historical frame is that late June at London City Airport is normally warm but not exceptional, with June’s climatological average high sitting around the high 20s and the warm season already established by this point.[1][6] On that basis, the current line leaves less room for a big upside surprise than for a routine peak in the 27–28°C area, so value is more likely to sit with contrarian buyers of the higher band if the forecast verifies stronger heating than expected.[1][2][5]

The main catalysts are the live forecast updates and the actual airport observations feeding through Wunderground’s daily history page, which is the settlement source.[1][8] With the settlement window closing at midday UTC, traders will be watching whether late-morning sun, cloud cover, or any shower activity caps the airport maximum below the forecast range; NOAA’s London City Airport observation feed already shows warm conditions and rising temperatures around midday, which supports the idea that the market’s favourite is well anchored but still exposed to a late-day overshoot.[3][9]

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

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

Where can I trade this market with the lowest fees?

On Who Will Win 2026, 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.

Is this market available outside the US?

Who Will Win 2026 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.

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.