Highest temperature in London on June 24?

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Market context

London is currently bracing for extreme heat, with forecasts predicting peak temperatures near 37°C on 24 June, significantly above the average June maximum of 21°C. The Polymarket contract for the highest temperature at London City Airport is pricing a 72% probability that the reading will stay at or below 35°C, despite the Met Office issuing a red warning for extreme heat. This on-chain market, settled in USDC on the Polygon network using conditional tokens, reflects a crowd belief that the day’s peak will likely fall just inside the 35°C bracket, even as current conditions show an amber warning already active with temperatures climbing.

Historical data frames this probability as cautious; while the highest UK temperature recorded in late May was 32.8°C, recent heatwaves have pushed London toward 36–37°C, making the 35°C threshold a tight line. The 70% frontrunner status for “35°C or below” suggests traders are betting against a record-breaking day, perhaps due to the station’s coastal location at EGLC, which often moderates peaks compared to central London. Comparable cases from previous June heat events show maxima averaging near 21°C, but the current anomaly of a 37°C forecast makes the 35°C cap a critical pivot point for resolution.

Traders must monitor the live Wunderground feed for the first data point published after midnight, as the market cannot resolve until this official record is logged. The Met Office forecast for a daily high of 37°C, with a maximum feels-like temperature matching that figure, is the primary catalyst; any deviation in real-time readings could shift the conditional token prices rapidly. Recent reports from the BBC confirm an active red warning, with southerly winds and 88% humidity driving pressure down, creating the exact conditions for a temperature spike that could breach the 35°C limit if the forecast holds.

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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.

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.

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.