Highest temperature in London on June 17?

Platform comparison

Active sub-markets

Market context

On 17 June 2026, the highest temperature recorded at London City Airport will fall into one of several defined ranges. The settlement mechanism relies on historical data pulled from Weather Underground's daily archive for that specific station, which sits in the Isle of Dogs and typically records temperatures slightly higher than central London due to its location and exposure. The 0% crowd probability suggests traders are either uncertain about the exact range boundaries or treating this as a calibration exercise rather than a live forecast.

London's June weather patterns show median highs around 20–22°C, with extremes historically reaching 28–30°C during heat waves. The 2022 heatwave saw temperatures exceed 35°C across the south-east, though City Airport's maritime influence tends to moderate peaks. For programmatic traders, the key variable is whether the market's temperature brackets align with typical June distribution or whether they've been set to capture tail events. Comparing this settlement against nearby stations (Heathrow, Stansted) via automated data pulls would reveal if City Airport's microclimate creates systematic divergence.

The critical dependency is Weather Underground's data availability and accuracy on the settlement date itself. Traders building conditional orders should verify the platform's historical uptime and whether any station maintenance or sensor recalibration is scheduled for June 2026. The Met Office's seasonal forecast, typically released in May, will provide ensemble guidance on whether June 2026 tracks toward above or below-normal temperatures—information that becomes actionable roughly three weeks before settlement.

Methodology

This page reviews Highest temperature in London on June 17? across five venues. We show live odds for Polymarket-based markets (sourced from the Polygon order book); for other venues we list platform attributes, since the comparable contracts are not exposed via a public API on every venue. Every CTA points at Polymarket Bot UK — the application we operate, where you trade directly against the Polymarket order book at 0% fees.

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 Bot 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.

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 Bot UK?

Zero. Polymarket Bot UK 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, Polymarket Bot UK triggers a quick verification flow that finishes in minutes.