Highest temperature in London on June 4?

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Market context

On 4 June 2026, London City Airport's weather station will record a daily high temperature in Celsius. The market currently prices all temperature ranges at 0% implied probability on the YES side, reflecting either technical settlement mechanics or minimal trading activity ahead of the event. Traders are pricing conditional tokens on Polygon against USDC, with resolution tied directly to Wunderground's historical weather data for that specific station and date.

London's June temperatures typically range between 18–23°C, though the city has recorded highs exceeding 30°C during early summer heat waves. The Met Office's 30-year climate average for early June shows mean daily maxima around 20°C, with variability driven by Atlantic weather systems and occasional continental air masses. Historical precedent matters here: June 2022 saw temperatures reach 32°C in parts of London, whilst June 2020 remained cooler at roughly 22°C average highs. The settlement window closes at midday on 4 June 2026, meaning traders must account for morning forecasts rather than full-day outcomes.

The UK Met Office and BBC Weather will publish extended forecasts from late May onwards, providing the primary catalyst for probability shifts. Long-range climate models from the European Centre for Medium-Range Weather Forecasts become more reliable within two weeks of the event. Traders should monitor whether spring 2026 develops high-pressure systems typical of warm June patterns, or whether Atlantic low-pressure dominates. Wunderground's historical data feed remains the sole authoritative source for settlement, making station-specific conditions—including urban heat effects around the airport—relevant to final resolution.

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 UK, which mirrors the Polymarket order book directly.

Resolution & payout

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

FAQ

Where can I trade this market with the lowest fees?

On Polymarket 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.

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.