Highest temperature in London on June 10?

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Market context

On 10 June 2026, the highest temperature recorded at London City Airport will fall into one of several defined ranges, with settlement determined by Wunderground's historical weather data for that specific station. The market currently prices all temperature brackets at 0% YES across Polygon, suggesting either extreme illiquidity, a technical display issue, or genuine uncertainty about which range will ultimately contain the day's peak. Traders holding conditional tokens representing any single temperature band would be betting against a market that has yet to establish meaningful price discovery on this future event.

London's June temperatures typically range between 18°C and 23°C, though the city has recorded highs exceeding 30°C during heatwaves in recent decades. The 2022 heatwave saw temperatures reach 40.3°C in parts of the UK, though London City Airport itself recorded lower peaks. Historical June data from the same station provides the most reliable baseline for assessing which temperature brackets carry genuine probability weight, since microclimatic variations between monitoring stations can shift outcomes by several degrees.

The UK Met Office publishes seasonal outlooks and monthly forecasts that typically become more precise in late May, roughly two weeks before settlement. Any significant Atlantic weather pattern shifts—including blocking high-pressure systems or unseasonal cold fronts—would alter the distribution of likely outcomes. Traders should monitor official Met Office guidance and Wunderground's own forecast updates as June approaches, since these will inform which temperature ranges accumulate liquidity and USDC depth on Polygon before the settlement window closes.

Methodology

This page reviews Highest temperature in London on June 10? 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 Kalshi UK — the application we operate, where you trade directly against the Polymarket order book at 0% fees.

Resolution & payout

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

FAQ

Is this market available outside the US?

Kalshi UK is available in most jurisdictions where Polymarket isn't directly accessible. Polymarket itself is geo-blocked in the US/UK/EU. Always check local regulations.

What does it cost to trade on Kalshi UK?

Zero. Kalshi 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, Kalshi UK triggers a quick verification flow that finishes in 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.