Highest temperature in London on June 8?

Platform comparison

Active sub-markets

Market context

On 8 June 2026, the highest temperature recorded at London City Airport will determine which range this market resolves to, with readings taken throughout the day and the peak value settling the outcome. The current crowd-implied probability of 0% suggests traders are either uncertain about the specific temperature bands available or have not yet engaged meaningfully with this contract. Wunderground's historical data for this station provides the authoritative settlement source, requiring traders to cross-reference daily maxima rather than relying on forecast models alone.

London's June temperatures typically range between 18°C and 24°C, though the city has recorded highs exceeding 30°C during heatwaves in recent decades. The 2022 June heatwave saw temperatures peak at 28.3°C at Heathrow, whilst more typical early-June conditions produce maxima in the low-to-mid 20s. Historical variance at City Airport—a riverside location with slightly different microclimatic conditions than central London—suggests traders should examine five-year comparisons rather than assuming seasonal norms will hold. The absence of early-season heatwave forecasts for late May 2026 currently supports expectations of moderate temperatures, though Atlantic weather systems can shift rapidly.

Traders should monitor the UK Met Office's extended outlook from late May onwards, as pressure systems and jet-stream positioning become clearer within two weeks of the settlement date. Any significant high-pressure system anchoring over the British Isles would shift probability towards higher temperature bands. The current 0% probability may reflect limited market liquidity rather than genuine consensus; comparable weather markets on other platforms would indicate whether this represents genuine trader indifference or pricing anomaly.

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

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

Where can I trade this market with the lowest fees?

On Best Prediction Markets, 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?

Best Prediction Markets 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 Best Prediction Markets?

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