Highest temperature in London on May 25?

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Market context

The highest temperature recorded at London City Airport on 25 May 2026 will determine which temperature band this market settles into, with resolution data sourced from Weather Underground's historical records for that specific station and date.

London's late May weather typically ranges between 15°C and 22°C, though the city has recorded highs exceeding 25°C during this period in recent decades. The 0% crowd probability suggests traders are either uncertain about the specific threshold bands available or treating this as a genuine weather forecasting challenge rather than a political event. Historical May temperatures at London City Airport show considerable year-to-year variation; May 2022 saw highs around 24°C whilst May 2019 peaked near 20°C. The Met Office's long-term climate data indicates late May averages of approximately 19°C, providing a baseline against which outlier temperatures can be assessed.

Traders monitoring this market should track seasonal weather patterns as May 2026 approaches, particularly any extended high-pressure systems forecast by the Met Office or European weather models in the weeks preceding settlement. Atmospheric conditions favouring continental air masses—typically associated with warmer continental European air flowing northwestward—would shift probabilities toward higher temperature bands. The settlement window closes at noon on 25 May, meaning real-time weather monitoring during the morning hours becomes critical for final position adjustments. Weather Underground's historical data collection at this specific airport station provides the definitive resolution source, making station-specific microclimatic factors relevant to traders' assessments.

Methodology

This page tracks Highest temperature in London on May 25? across four political prediction venues. Live odds come from the Polymarket order book (the deepest political prediction-market book). Kalshi is the CFTC-regulated US alternative, Betfair the established UK sports-exchange with politics markets, Manifold the open play-money variant. PolyGram routes every trade through to Polymarket — at 0% fees.

Resolution & payout

For political markets the resolution source is decisive. Polymarket defines a concrete source per contract (e.g. AP, Reuters, official electoral commission) and uses the UMA Optimistic Oracle as the on-chain dispute mechanism. With a clearly defined outcome the USDC payout lands within minutes of the final confirmation.

FAQ

Is this market available outside the US?

PolyGram 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.

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, PolyGram 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.