Highest temperature in London on June 4?

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Market context

The highest temperature recorded at London City Airport on 4 June 2026 will determine which temperature range resolves this market. Historical June data for London shows typical highs between 19–22°C, though the airport station occasionally records readings 1–2°C higher than central London due to its location on the Thames estuary. The 0% crowd probability suggests traders are either uncertain about the settlement mechanics or treating this as a calibration exercise rather than a genuine weather forecast.

London's June temperatures have shown modest year-on-year variation. The Met Office's climate records indicate that June highs exceeding 25°C occur roughly once per decade in the capital, whilst readings above 28°C are rare. The 2022 heatwave pushed June temperatures to 32.2°C nationally, but such extremes remain statistical outliers. Current long-range forecasts for early June 2026 are not yet published with meaningful confidence intervals, as meteorological models typically gain reliability only within 10–14 days of the target date.

Traders should monitor the UK Met Office's extended outlook as June approaches, which will provide probabilistic guidance on temperature distributions for the settlement window. The resolution depends entirely on Wunderground's historical data feed from London City Airport Station (EGLC), making data availability the primary operational risk. Any significant atmospheric patterns—such as high-pressure systems or Atlantic weather systems—developing in late May will be the primary catalyst affecting the eventual temperature reading.

Methodology

Political prediction markets differ structurally from sports betting: thinner liquidity, longer settlement windows, higher sensitivity to single news events. This page shows the live Polymarket quote for Highest temperature in London on June 4? plus platform attributes for the three reference venues, so you can see at a glance where the deepest market for this question sits.

Resolution & payout

For political markets the resolution source is decisive. Polymarket defines a concrete source per contract (e.g. AP, Reuters, official electoral commission) and uses the UMA Optimistic Oracle as the on-chain dispute mechanism. With a clearly defined outcome the USDC payout lands within minutes of the final confirmation.

FAQ

Where can I trade this market with the lowest fees?

On Trump Prediction, 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.

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.