Highest temperature in London on June 12?

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Market context

The highest temperature recorded at London City Airport on 12 June 2026 will determine the resolution of this market. The settlement window closes at midday on that date, capturing the peak temperature for the full calendar day as measured by Wunderground's historical weather data for the EGLC station.

London's June temperatures typically range between 18°C and 24°C, though heat waves can push readings into the high 20s or low 30s. The 0% crowd probability suggests traders are pricing in an expectation that the market's upper temperature bands will not be reached. Historical June records at London City Airport show that temperatures exceeding 28°C occur in roughly one in five years, whilst readings above 30°C remain uncommon. The 2022 heatwave, which saw parts of the UK reach 40°C, did not affect London City Airport to the same degree, with that station recording a peak of 31.8°C on 19 July rather than in June.

Traders should monitor long-range weather forecasts from the Met Office and European weather models as June approaches, particularly any signals of high-pressure systems or continental air masses moving into the UK during the second week of the month. Seasonal patterns suggest early June typically remains cooler than mid-to-late summer, though anomalous warmth can occur. The specific microclimate at London City Airport, located on the Thames estuary, may differ from central London readings, potentially moderating extreme temperatures compared to inland locations.

Methodology

This page reviews Highest temperature in London on June 12? across five venues. We show live odds for Polymarket-based markets (sourced from the Polygon order book); for other venues we list platform attributes, since the comparable contracts are not exposed via a public API on every venue. Every CTA points at Sport Prediction — the application we operate, where you trade directly against the Polymarket order book at 0% fees.

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 Sport Prediction, 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?

Sport Prediction 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.

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, Sport Prediction 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.