Highest temperature in London on May 26?

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Market context

On 26 May 2026, the highest temperature recorded at London City Airport will fall into one of several defined ranges. The settlement will draw from Wunderground's historical weather data for that specific station, which sits in East London and typically captures urban microclimatic conditions distinct from broader London readings. The 0% crowd probability suggests traders currently see no conviction in any particular temperature band, or the market may lack sufficient liquidity to establish meaningful odds.

London's May weather exhibits considerable year-on-year variance. Historical data from the Met Office shows May highs in the capital ranging from 16°C in cooler years to 28°C during warmer spells, with a 30-year average around 20°C. The 2022 heatwave saw late-May temperatures exceed 25°C across southern England, whilst 2021 and 2023 saw more moderate conditions. This historical spread means multiple temperature ranges remain plausible, which may explain why the market has attracted minimal positioning so far.

Traders should monitor the UK Met Office's seasonal outlook for spring 2026, typically issued quarterly, and track Atlantic pressure patterns from February onwards—these influence whether high-pressure systems deliver warm continental air or Atlantic lows bring cooler maritime conditions. The North Atlantic Oscillation index and sea surface temperature anomalies in the Atlantic will be key catalysts shaping May's weather trajectory. Wunderground's data collection methodology at EGLC (the ICAO code for London City Airport) remains consistent, though any station maintenance or sensor recalibration could theoretically affect recorded values, though such events are rare and usually documented.

Methodology

This page reviews Highest temperature in London on May 26? across five venues. We show live odds for Polymarket-based markets (sourced from the Polygon order book); for other venues we list platform attributes, since the comparable contracts are not exposed via a public API on every venue. Every CTA points at PolyGram — the application we operate, where you trade directly against the Polymarket order book at 0% fees.

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

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.

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 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.

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.