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 market currently shows 0% implied probability across all temperature brackets, suggesting either extreme uncertainty amongst traders or a technical lag in pricing. Settlement depends on historical data from Wunderground's London City Airport Station records, with the window closing at 12:00 UTC on the day itself. Traders are effectively pricing conditional tokens on USDC via Polygon, where each outcome bracket represents a discrete settlement value.

June temperatures at London City Airport typically range between 18°C and 24°C, based on thirty-year climate normals. The station's historical record shows that temperatures above 28°C are rare in early June, though the summer of 2022 saw anomalously warm conditions across the UK. A 0% crowd probability across all brackets is unusual and may reflect low liquidity or delayed market calibration rather than genuine forecaster consensus that no temperature will be recorded.

The UK Met Office publishes its monthly outlook in late May, which will provide the most recent seasonal guidance ahead of settlement. Any significant Atlantic weather systems or high-pressure systems tracking towards the British Isles in late May would shift expectations materially. Traders should monitor the Met Office's 5–7 day forecast from late May onwards, as this window typically offers reliable guidance for early June conditions. The actual settlement hinges entirely on Wunderground's historical data capture for that specific station on that specific date.

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). The odds column is filled only where we have clean data — that avoids the made-up numbers that get a network demoted when search engines cross-check against the source venue.

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

Is this market available outside the US?

Polymarket UK 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'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.

What does it cost to trade on Polymarket UK?

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

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, Polymarket UK triggers a quick verification flow that finishes in minutes.