Highest temperature in London on June 9?

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Market context

On 9 June 2026, the highest temperature recorded at London City Airport will fall into one of several defined ranges, with settlement determined by historical weather data from Wunderground. The current crowd-implied probability of 0% YES suggests traders are pricing in extremely low conviction for the specific outcome this market tracks, though the settlement mechanism itself—measuring the single highest reading across the entire day—remains straightforward and verifiable.

London's June weather patterns show considerable variability. Historical June temperatures at City Airport typically range between 15°C and 25°C, with occasional peaks above 26°C during warmer years. The 0% probability reading diverges sharply from the meteorological baseline; even conservative seasonal forecasts would assign non-trivial probability mass to moderate temperature outcomes. This gap between market pricing and climatological precedent suggests either thin liquidity, specification ambiguity regarding which temperature range the market resolves to, or trader uncertainty about the exact settlement procedure rather than genuine conviction that no measurable temperature will occur.

Traders should monitor the UK Met Office's seasonal outlook for early June 2026 as it approaches, typically issued 2–3 weeks prior. Atlantic weather patterns and any anomalous high-pressure systems over the British Isles in late May would be the primary catalysts affecting June 9th conditions. The settlement window closes at 12:00 UTC on the day itself, meaning final temperature readings will be locked once the afternoon peak has passed. Wunderground's historical data feed for City Airport (EGLC) provides the sole authoritative source, making data accessibility and archive completeness the only operational dependencies.

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.

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.

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.