Highest temperature in London on June 27?

Platform comparison

Active sub-markets

Market context

The highest temperature recorded at London City Airport on 27 June 2026 will determine the outcome of this prediction market, yet the crowd-implied probability for any YES result sits at 0%. This stark pricing reflects the on-chain mechanics of Polymarket, where USDC on the Polygon network is used to back conditional tokens that resolve only once Wunderground publishes the first data point for the date. Traders are effectively betting that the temperature will fall outside the defined range, a stance that ignores the recent volatility in UK summer weather.

Historical context suggests caution in accepting the 0% probability as definitive. The UK has provisionally seen a new maximum June temperature record for the third consecutive day, with 37.3°C reached at Santon Downham in Suffolk on 26 June, while London City Airport itself forecast a maximum of 36°C for the same period[1]. Although Kew Gardens recorded 26.6°C as the hottest day of 2026 so far just weeks prior, the rapid escalation in temperatures indicates that June 27 could easily breach typical thresholds, making the current pricing appear overly dismissive of the heatwave potential[7].

A trader should monitor the Met Office’s daily forecast updates and the specific wind patterns, as the current south-south-westerly flow at 12 mph is carrying moisture that could influence peak temperatures[3]. The falling pressure of 1011mb also signals atmospheric instability that often precedes temperature spikes, a dependency that warrants close observation before the settlement window closes[3]. While no specific announcement has altered the forecast yet, the convergence of record-breaking regional highs and local instability suggests the market may be mispricing the risk of an extreme temperature event.

Sources: 1 · 2 · 3 · 4 · 5

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 Polymarket Scam?, 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 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.