Highest temperature in London on June 12?

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Market context

On 12 June 2026, the highest temperature recorded at London City Airport will determine which range this contract settles into. The 0% crowd probability suggests traders are pricing in either extreme confidence in a specific outcome or minimal liquidity and participation. Settlement hinges on Wunderground's historical weather data for that single day, with the measurement taken across all daylight and evening hours at the airport's official station.

London's June temperatures typically range between 15–22°C, though heat waves occasionally push readings into the mid-to-high 20s. The summer of 2022 saw exceptional heat across the UK, with some southern locations exceeding 30°C in early July, whilst June that year remained more moderate. The Met Office's long-term records show June highs in London cluster around 20–21°C as a median, with extremes on record reaching 28°C. This historical distribution should anchor expectations for what constitutes an outlier versus a routine day.

The key variable is whether a heat dome or Atlantic low-pressure system dominates the week leading into mid-June 2026. The UK Met Office typically issues extended forecasts 10–14 days ahead; traders should monitor their official outlook around late May and early June for signals of anomalous warmth. Any significant weather warnings or heatwave alerts issued in the preceding week would shift probability distributions sharply. Conversely, if persistent cloud cover or Atlantic moisture dominates forecasts, cooler ranges become more likely. The conditional token mechanics on Polygon mean early position-taking carries execution risk if liquidity remains thin.

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

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

FAQ

Where can I trade this market with the lowest fees?

On Polymarket Scam?, 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 Scam? 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.

What does it cost to trade on Polymarket Scam??

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

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.