Highest temperature in London on June 16?

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Market context

On 16 June 2026, the highest temperature recorded at London City Airport will fall into one of several defined ranges. A YES share in this market pays out if the actual high temperature matches your chosen bracket; a NO share pays if it falls outside that range. The settlement relies on historical weather data from Weather Underground, specifically the peak temperature logged across all hours on that single day at the airport's official monitoring station.

London's June climate typically produces highs between 18°C and 24°C, though extremes do occur. The current 0% probability assigned to YES suggests traders expect the actual temperature to fall outside all listed ranges, or that uncertainty about which specific bracket will resolve correctly has fragmented the market. Historical June records for the capital show that temperatures above 28°C are rare but not unprecedented—the UK recorded 32.2°C in June 2022—making extreme outcomes plausible but low-frequency events. Seasonal norms favour moderate ranges, yet the breadth of possible outcomes means traders must weigh both typical June patterns and tail-risk scenarios.

The key dependency is the Met Office's seasonal forecast, typically released in May, which may signal whether June 2026 is expected to run warmer or cooler than the 30-year average. Real-time tracking becomes relevant only in the final week before settlement, when synoptic charts clarify whether high-pressure systems or Atlantic weather systems will dominate. Traders should monitor long-range European weather models from mid-May onwards, as these provide the most reliable signal for June temperature regimes in the UK.

Methodology

This page reviews Highest temperature in London on June 16? 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 Prediction Market UK — 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

Is this market available outside the US?

Prediction Market UK 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'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.

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.

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.