Highest temperature in London on June 12?

Platform comparison

Active sub-markets

Market context

On 12 June 2026, the highest temperature recorded at London City Airport will fall into one of several defined ranges. The market currently prices all outcomes at 0% YES across the board on Polygon, suggesting either extreme illiquidity or a technical issue with how conditional tokens are displaying. Settlement hinges on Wunderground's historical weather data for that specific station, which sits in the Docklands area and typically records slightly warmer readings than central London due to its location near water and urban heat effects.

London's June temperatures have historically ranged from lows of 11°C to highs exceeding 30°C, though the median maximum hovers around 21–23°C. The 2022 heatwave pushed readings to 40.3°C nationally, but London City Airport itself recorded 35.4°C that June. Traders should reference the UK Met Office's seasonal outlooks and any El Niño or La Niña patterns affecting Atlantic weather systems, as these drive whether June 2026 tracks toward the cooler or warmer end of the historical distribution.

The key catalyst is the Met Office's long-range forecast, typically updated monthly, which will clarify whether atmospheric conditions favour above or below-average temperatures for early summer. Traders should also monitor late May weather patterns—persistent high pressure systems or Atlantic storm tracks in the preceding weeks often signal the direction June will take. The settlement window closes at noon UTC on the day itself, so real-time monitoring of Wunderground's live data becomes critical in the final hours.

Methodology

We track Highest temperature in London on June 12? on the five venues with material liquidity for prediction markets. Live odds come from the Polymarket Polygon order book — the only source that ships real-time data under an open licence. For Kalshi, Betfair and Manifold we list platform attributes (fee, KYC, settlement, payment) instead of fabricated odds, because their APIs use non-comparable contract definitions.

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 Legit?, 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?

Polymarket Legit? 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'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 Legit??

Zero. Polymarket Legit? routes every order to the live Polymarket order book; the only cost is the Polygon network fee, typically under $0.01 per transaction.

Do I need to KYC for this market?

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