Highest temperature in London on June 6?

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Market context

London's highest temperature on 6 June 2026 will be measured at City Airport Station and resolved against historical weather records. The settlement window closes at midday UTC, meaning the final reading must be captured before noon or the market will resolve based on data available through that point. For traders automating resolution checks, Wunderground's historical data interface requires manual navigation to the specific station and date, though the API endpoint structure remains consistent across weather events.

London's June temperatures typically range between 18–24°C, with extremes rarely exceeding 28°C in early June. The 0% crowd probability suggests either extreme confidence in a narrow outcome or insufficient liquidity to establish meaningful odds. Historical precedent from comparable markets shows that weather prediction markets often compress towards settlement as observational data replaces forecasting; the current flat probability may reflect genuine uncertainty about which temperature band will resolve, rather than dismissal of any particular range.

The Met Office publishes extended forecasts up to ten days ahead, with updates every six hours. Traders should monitor late-May weather patterns—particularly Atlantic pressure systems and any early heat domes—as these typically determine early June conditions across southern England. The settlement source's reliance on City Airport Station data means urban heat effects and station-specific microclimates matter; this location sits in East London's built-up area, which can run 1–2°C warmer than surrounding regions during high-pressure systems.

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

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

FAQ

Where can I trade this market with the lowest fees?

On Polymarket App 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.

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 Polymarket App UK?

Zero. Polymarket App UK 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.

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, Polymarket App UK triggers a quick verification flow that finishes in minutes.