Highest temperature in London on May 26?

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Market context

The highest temperature recorded at London City Airport on 26 May 2026 will determine which temperature band this market resolves to, with settlement based on Wunderground's historical weather data for that specific station and date.

London's late May weather typically ranges between 15°C and 22°C, though temperatures can occasionally exceed 25°C during warm spells. Historical records from the Met Office show that May 26 has seen highs varying considerably year to year—some years reaching only 17°C whilst others have climbed to 24°C or higher. The 0% crowd probability suggests traders are either uncertain about the range options available or expect cooler conditions relative to typical late-spring patterns. Comparable May dates at London City Airport have produced a wide distribution of outcomes, making this less predictable than summer months when warming trends stabilise.

The primary catalyst affecting this market's resolution will be atmospheric patterns developing in late May 2026, particularly whether high-pressure systems establish over the British Isles or Atlantic weather systems deliver cooler maritime air. Traders should monitor seasonal forecasting updates from the Met Office and European weather models as May approaches, though such long-range predictions carry substantial uncertainty. The settlement window closes at midday on 26 May, meaning real-time weather observations will be the decisive factor rather than advance forecasts.

Methodology

This page tracks Highest temperature in London on May 26? 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

Political markets typically settle on official candidate or agency confirmation. Polymarket uses UMA Optimistic Oracle: a proposer posts the outcome with a bond, the two-hour window opens, then the smart contract pays USDC.

Kalshi settles USD via CFTC clearinghouse, with clearly defined resolution sources (e.g. AP race calls for elections). Betfair settles after the official outcome is registered with the league or agency. Manifold is play-money.

FAQ

Where can I trade this market with the lowest fees?

On PolyGram, 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?

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 does it cost to trade on PolyGram?

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

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.

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.