Highest temperature in London on June 26?

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Market context

London is experiencing an exceptionally hot spell, with the Met Office forecasting a maximum daytime temperature of 38°C for London City Airport today, marking the hottest June day in the UK since 1976[1]. Historical data shows that late June in London typically sees highs around 26°C, but recent years have broken records, including a 33.5°C reading at Heathrow just two days prior[5]. The current crowd-implied probability of 0% for the highest temperature falling in a specific range appears contradictory given these extreme conditions, as similar heatwaves in 2018 and 2022 saw temperatures exceeding 30°C at EGLC[7].

Traders should monitor real-time updates from Wunderground, the official resolution source, as the settlement window closes at 12:00 UTC today[1]. The BBC Weather station at EGLC currently records 13°C at 10:00 BST, but this is a morning dip before the peak heat expected later in the day[2]. Key dependencies include the persistence of hazy sunshine and southerly winds, which the Met Office warns could push temperatures to record highs by afternoon[1]. A beat-reporter from Battersea Beat noted the breaking of the hottest June record on 24 June, suggesting the trend is accelerating rather than reversing[6].

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 Sport Prediction, which mirrors the Polymarket order book directly.

Resolution & payout

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

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.

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 Sport Prediction?

Zero. Sport Prediction routes every order to the live Polymarket order book; the only cost is the Polygon network fee, typically under $0.01 per transaction.

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.