Highest temperature in London on June 8?

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Market context

The settlement hinges on the highest temperature recorded at London City Airport on 8 June 2026, with the crowd currently assigning zero probability to any outcome. This absence of trading activity suggests either extreme confidence in a particular temperature band or insufficient market participation to establish meaningful odds. London's June weather typically ranges between 18–23°C, though heat waves can push readings into the high 20s or low 30s.

Historical June data from London City Airport shows that temperatures exceeding 28°C occur in roughly one year per decade, whilst readings above 25°C are more routine. The 0% probability assigned to all ranges reflects the market's early stage rather than genuine certainty about the outcome. Given that June 2026 remains eighteen months away, seasonal forecasting models carry substantial uncertainty. The Met Office's long-range outlooks, published quarterly, will provide the first meaningful signal about whether anomalous warmth is likely; traders should monitor these releases from late 2025 onwards.

The key catalyst will be the emergence of seasonal climate patterns in spring 2026, particularly the Atlantic Oscillation and jet stream positioning, which determine whether continental warm air reaches the UK. Short-range forecasts become reliable only in the final week before 8 June. Early value may exist in temperature bands currently priced at zero if historical frequency data suggests they should carry modest probability, though the lack of liquidity means wide bid-ask spreads will persist until closer to settlement.

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

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 Who Will Win?

Zero. Who Will Win 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.

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.