Highest temperature in London on June 7?

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Market context

On 7 June 2026, the highest temperature recorded at London City Airport will fall into one of several defined ranges, with traders on Polymarket currently pricing all outcomes at 0% probability—a technical artefact of how conditional tokens settle on Polygon rather than a genuine forecast. The market will resolve based on Wunderground's historical weather data for that specific station, measured in Celsius, with settlement occurring after the day closes at midday UTC.

London's June temperatures have historically clustered between 18°C and 24°C, though extremes do occur. The 7 June date itself carries no particular meteorological significance; what matters is the broader pattern of early summer weather systems affecting southern England. The 0% crowd probability reflects the market's current illiquidity rather than confidence in any particular temperature band. Comparable markets on seasonal UK temperatures show traders typically distinguish between outcomes spanning 2–3°C intervals, with higher ranges (above 25°C) receiving modest backing only when Atlantic high-pressure systems are forecast.

The UK Met Office publishes its extended forecast roughly ten days in advance, with updates every few days as June 2026 approaches. Traders should monitor whether persistent high-pressure systems develop over the Atlantic in late May, which would be the primary catalyst for above-average temperatures. Conversely, Atlantic low-pressure troughs or northerly flow would suppress readings. The settlement window closes at midday on the day itself, leaving no opportunity for late-breaking weather revisions, so positioning must reflect confidence in forecasts issued in early June.

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 Kalshi 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.

Is this market available outside the US?

Kalshi UK 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.

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, Kalshi UK 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.