Highest temperature in London on June 22?

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Active sub-markets

Market context

London City Airport’s maximum temperature for the day is the settlement driver, and the current 0% YES price implies the market is treating a high enough reading as extremely unlikely. The live weather setup matters because late-June London can still produce sharp afternoon spikes if sunshine, light winds and a dry air mass align, but the airport is also exposed to onshore changes and showers that can cap the day’s peak. At 2pm UTC, the market is still trading before the likely daily maximum is usually set, so the book can move quickly if the forecast or observed trend shifts.

The historical frame is straightforward: London City Airport’s June highs are normally in the low-to-mid 20s Celsius, while genuine heat events are much rarer and usually require a broader UK warm spell. BBC Weather currently shows London City Airport with a forecast high of 28C today, with a hotter outlook later in the week, including 34C on Tuesday and 36C on Wednesday, which is a reminder that traders often reprice weather markets as the wider heat plume changes rather than on local conditions alone.[1] The Met Office also had 30C as the forecast maximum for the airport today, reinforcing that this is a warm day but not yet a record-chasing one.[5]

For traction, the key issue is not just temperature but funding friction: prediction-market depth tends to improve when deposits are easy, fast and cheap, and weaker when users hit rails they do not trust. Klarna-style card funding lowers the first-step barrier for smaller positions, while SEPA and USDC matter more for larger or repeat inflows because they reduce the drag of transfer timing and fees. In practice, a weather market like this tends to get the most depth when traders can move in and out quickly around new forecast updates, and the strongest catalyst is any fresh Met Office or airport-forecast revision that changes the expected daytime peak before the settlement window closes.[5]

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 Klarna UK — the application we operate, where you trade directly against the Polymarket order book at 0% fees.

Resolution & payout

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

FAQ

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 Polymarket Klarna UK?

Zero. Polymarket Klarna UK routes every order to the live Polymarket order book; the only cost is the Polygon network fee, typically under $0.01 per transaction.

How fast are USDC deposits?

Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within minutes.

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, Polymarket Klarna UK triggers a quick verification flow that finishes in minutes.