Highest temperature in London on June 1?

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Market context

On 1 June 2026, the highest temperature recorded at London City Airport will fall into one of several defined ranges. The settlement mechanism pulls historical weather data from Wunderground's daily archive for that specific station, making this a straightforward factual resolution tied to a single, verifiable data point rather than forecaster interpretation or averaging across multiple sites.

London's June temperatures have historically clustered between 20–24°C, with occasional peaks above 25°C during warm spells. The Met Office's 30-year climate normals show a June mean of approximately 19°C, though the daily maximum typically reaches 21–22°C. Outlier years—such as June 2022, when parts of southern England exceeded 30°C—remain statistically rare but not unprecedented. For traders building conditional orders or automated monitoring systems, the 0% crowd probability suggests either extreme scepticism about high-temperature outcomes or insufficient liquidity to reflect genuine uncertainty. Comparing to comparable June markets across prior years provides calibration: temperatures below 20°C occur roughly 25–30% of the time, whilst readings above 25°C materialise in perhaps 15–20% of June days at City Airport specifically.

Traders should monitor the Met Office's extended forecast from mid-May onwards, particularly any high-pressure systems or continental air masses predicted for early June. The UK's Atlantic exposure means late-spring weather remains volatile; a blocking anticyclone could push temperatures well above seasonal norms, whilst unsettled westerly flow would suppress them. Historical Wunderground data for the station itself—rather than broader London readings—should be your reference point for calibrating range boundaries before settlement.

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 App UK, which mirrors the Polymarket order book directly.

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

Where can I trade this market with the lowest fees?

On Polymarket App 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.

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.

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 App 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.