Highest temperature in London on June 26?

Platform comparison

Active sub-markets

Market context

On 26 June 2026, London City Airport will record its peak temperature for the day, a real-world event that determines the outcome of a prediction market resolving to a specific Celsius range. The current crowd-implied probability of 0% for the "YES" outcome appears contradictory to the market’s leading bets, which favour 35°C at 37% and 34°C at 31%, suggesting a significant mispricing or data lag in the probability feed[1]. Historically, late June in London has seen extreme heat, with 33.9°C recorded at Heathrow in June 2022—the hottest June day in the UK since 1976—providing a strong comparable case that temperatures can breach 34°C in this period[7]. The warm season, running from mid-June to early September, typically delivers average daily highs above 67°F (19.4°C), but heatwaves frequently push readings well beyond this baseline[4].

Traders approaching this market programmatically should monitor real-time inputs from Wunderground and the Met Office, which forecast a maximum daytime temperature of 26°C for London City Airport today, with a potential spike to 32°C under specific conditions[2][6]. Key catalysts include the timing of south-westerly wind shifts and humidity drops, which can rapidly elevate temperatures; a recent BBC report noted a red heat warning issued as temperatures hit 33.5°C at Heathrow in May 2024, underscoring the volatility of UK summer weather[5]. Conditional order bots should be set to trigger on Wunderground’s hourly updates, as the settlement window ends at 12:00 UTC on 26 June, requiring precise alignment with the station’s recorded peak[1]. The market’s resolution hinges on the highest temperature recorded at London City Airport Station, making it essential to track live data feeds rather than relying on static forecasts[1].

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 Bot UK, 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

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.

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, Polymarket Bot UK 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.