Highest temperature in London on June 25?

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Market context

On 25 June 2026, London City Airport will record its peak temperature for the day, a single data point that determines whether a prediction market resolves to “YES” or “NO” for the 26°C or below outcome. The current crowd-implied probability of 1% YES suggests traders expect a significantly warmer day, with the frontrunner outcome at 30°C holding 27% of the market weight and 31°C at 25%[1]. This aligns with historical patterns: the warm season at London City Airport runs from mid-June to early September, with average daily highs exceeding 67°F (19.4°C), and recent years showing June peaks frequently reaching 28–32°C[6].

For a power-user approaching this programmatically, the key is to monitor real-time Wunderground feeds for the EGLC station and cross-reference with Met Office and BBC Weather updates for immediate atmospheric shifts[3][4]. A critical catalyst is the falling pressure trend (1012mb) and high humidity (88%) observed at 01:00 BST, which can suppress peak temperatures if cloud cover persists, though mainly sunny conditions forecasted for tomorrow suggest a high-heat scenario[4]. Traders should also watch for any sudden wind shifts or rain announcements, as even a 30% rain chance at 6am could alter the thermal profile[3]. Recent weather data from Weather Underground confirms that London City Airport can experience extreme heat, with past records showing highs near 88°F (31.1°C) on similar dates[7].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). The odds column is filled only where we have clean data — that avoids the made-up numbers that get a network demoted when search engines cross-check against the source venue.

Resolution & payout

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

FAQ

Where can I trade this market with the lowest fees?

On Polymarket Bot UK, 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 Bot 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.