Highest temperature in London on June 6?

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Market context

On 6 June 2026, the highest temperature recorded at London City Airport will fall into one of several defined ranges, with settlement determined by historical weather data from Wunderground. The 0% crowd probability suggests traders are either heavily discounting certain temperature bands or the market has attracted minimal participation. London's June temperatures typically range between 18–24°C, though extremes occasionally push toward 28–30°C during early-summer heat waves.

Historical June records for London show considerable variability. The Met Office records indicate that whilst average highs in early June sit around 21°C, outlier days have reached 29°C or higher during anomalous warm spells. The 2022 heatwave pushed June temperatures well above seasonal norms across southern England, demonstrating that whilst rare, significant departures from the mean do occur. Current market pricing at 0% across all ranges suggests either extreme confidence in a narrow band or insufficient liquidity to establish differentiated odds.

The primary catalyst remains the UK Met Office's seasonal forecast and real-time weather models in late May and early June 2026. Traders should monitor Atlantic pressure systems and any blocking high-pressure patterns that could drive continental air masses into the UK during the settlement window. The settlement mechanism—relying on Wunderground's London City Airport station data rather than broader Met Office stations—introduces a site-specific variable; airport microclimates can differ from city-centre readings. Resolution occurs at 12:00 UTC on 6 June, meaning overnight and early-morning temperatures will not factor into the final determination.

Methodology

This page is a comparison snapshot: one live quote (Polymarket), four reference venues with their key attributes, and a single execution path — every trade button routes to Best Prediction Markets, which mirrors the Polymarket order book directly.

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 Best Prediction Markets, 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?

Best Prediction Markets 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, Best Prediction Markets 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.