Highest temperature in London on June 10?

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Market context

On 10 June 2026, the highest temperature recorded at London City Airport will determine the settlement range for this market. The Met Office and historical weather records show that early June temperatures in London typically range between 18–23°C, though heat waves can push readings into the high 20s. The current 0% crowd probability suggests traders are either awaiting fresh data or treating this as a placeholder pending deposit flows and book depth accumulation. Payment friction remains material: traders depositing via Klarna or SEPA rails often experience settlement delays of 24–48 hours, which can shift positioning if weather forecasts update sharply between now and the settlement window closing at noon UTC on 10 June.

Historical June weather in London shows that temperatures exceeding 25°C occur roughly once every three to four years during early summer. The 2022 heatwave reached 32°C in parts of the UK, but that occurred in July; June records are more moderate. Wunderground's London City Airport station data, the designated resolution source, typically aligns with broader Met Office readings within 1–2°C, making it a reliable benchmark for settlement disputes.

Traders should monitor the UK Met Office's extended forecast updates, released Tuesdays and Fridays, which refine ten-day outlooks. Any Atlantic high-pressure system tracking towards the UK in early June would be the primary catalyst for elevated temperature ranges. Liquidity depth will likely correlate with deposit availability on the platform; USDC on-ramps currently clear faster than traditional banking rails, potentially concentrating trading activity in the 48 hours before 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

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 Polymarket Klarna 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.

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 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.