Highest temperature in London on June 9?

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Market context

The highest temperature recorded at London City Airport on 9 June 2026 will determine which temperature band resolves as YES. Settlement depends on historical weather data from Wunderground, with the final reading locked in at 12:00 UTC on that date. London's June temperatures typically range between 18°C and 24°C, though extremes occasionally push toward 28–30°C during heat waves.

London has experienced notable temperature variation in early June across recent decades. The Met Office records show June highs averaging 21–23°C in the capital, with the warmest June days on record reaching 32°C (2022 saw exceptional heat). City Airport, situated on the Thames estuary, tends to record slightly cooler readings than central London due to proximity to water and lower urban heat island effects. This geographical factor historically moderates peak temperatures by 1–3°C compared to inland stations.

Traders should monitor long-range weather forecasts released in late May and early June, particularly from the Met Office and European Centre for Medium-Range Weather Forecasts. High-pressure systems moving across the UK in early summer typically drive temperatures upward; conversely, Atlantic low-pressure systems bring cooler, wetter conditions. The current 0% probability suggests the market may be pricing in below-average June conditions or reflecting uncertainty about which specific temperature band will ultimately resolve. Real-time forecast updates from mid-May onwards will provide the clearest signal of likely conditions for that specific date.

Methodology

This page tracks Highest temperature in London on June 9? across four political prediction venues. Live odds come from the Polymarket order book (the deepest political prediction-market book). Kalshi is the CFTC-regulated US alternative, Betfair the established UK sports-exchange with politics markets, Manifold the open play-money variant. Trump Prediction routes every trade through to Polymarket — at 0% fees.

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 does it cost to trade on Trump Prediction?

Zero. Trump Prediction 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, Trump Prediction triggers a quick verification flow that finishes in minutes.