Highest temperature in London on June 9?

Platform comparison

Active sub-markets

Market context

London's weather on 9 June 2026 will determine which temperature band captures the day's peak reading at City Airport. The settlement hinges on Wunderground's historical data for that specific station, with resolution occurring after the trading window closes at midday UTC. Traders depositing via Klarna or SEPA transfers will need to account for settlement timing when planning their position sizing and withdrawal strategy.

London's June temperatures typically range between 18–24°C, though heat waves can push readings into the high 20s or low 30s. The 0% crowd probability suggests the market has not yet attracted sufficient liquidity to establish meaningful price discovery across temperature bands. Historical June records show variability: the Met Office documented 32.4°C on 30 June 1976 during an exceptional drought, whilst more typical June peaks sit 5–8°C lower. This wide historical spread means traders face genuine uncertainty rather than a settled consensus.

The UK Met Office and BBC Weather will publish their June forecasts in early May 2026, providing the primary catalyst for position adjustments. Atmospheric patterns in late May—particularly the North Atlantic Oscillation and jet stream positioning—will signal whether continental heat reaches the British Isles or Atlantic systems dominate. Traders should monitor European weather models from mid-May onwards, as these typically show skill 10–14 days ahead. Book depth will likely increase once forecasts narrow the range; early depositors via faster on-ramps like USDC may capture better odds before the crowd reprices around meteorological signals.

Methodology

This page reviews Highest temperature in London on June 9? 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 Klarna UK — the application we operate, where you trade directly against the Polymarket order book at 0% fees.

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 Klarna 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 Klarna UK?

Zero. Polymarket Klarna 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.