Highest temperature in London on June 14?

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Market context

The highest temperature recorded at London City Airport on 14 June 2026 will determine this market's settlement. The current crowd-implied probability of 0% suggests traders expect the actual reading to fall outside whichever temperature band this contract represents, though the specific range threshold remains unclear from available market data. Cross-platform comparison reveals meaningful divergence: traditional weather forecasting services and sportsbook-adjacent climate markets typically assign non-zero probability to most temperature outcomes within plausible ranges for mid-June London, whereas this contract's zero probability indicates either an extremely narrow or implausibly high/low temperature band.

Historical June temperatures at London City Airport show a median high around 20–22°C, with records reaching 28°C in exceptional years. The 30-year average for mid-June sits near 21°C. This baseline matters because it contextualises how extreme the settlement threshold must be to justify zero probability. If the contract resolves to a range like "above 35°C," the zero probability reflects genuine meteorological rarity; if it covers a band like "18–24°C," the zero probability suggests either data-sourcing issues or a market design problem.

Traders should monitor UK Met Office forecasts released in the week preceding 14 June, which will provide 10-day outlooks with greater precision than current seasonal models. Wunderground's historical data feed occasionally experiences delays or corrections, so settlement timing may extend beyond the stated window. The contract's reliance on a single airport station rather than broader London measurements introduces localised weather variation—City Airport's riverside location can produce microclimatic effects distinct from central London readings.

Methodology

This page is a comparison snapshot: one live quote (Polymarket), four reference venues with their key attributes, and a single execution path — every trade button routes to Best Prediction Markets, which mirrors the Polymarket order book directly.

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 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, Best Prediction Markets triggers a quick verification flow that finishes in 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.