Highest temperature in London on June 6?

Platform comparison

Active sub-markets

Market context

On 6 June 2026, the highest temperature recorded at London City Airport will settle into one of several defined ranges. The settlement source is Wunderground's historical weather data for that specific station, measured in Celsius. The 0% crowd probability suggests traders are either confident the market will not resolve, uncertain about the data source's availability, or treating this as a placeholder pending clarification on range definitions.

London's June temperatures typically peak between 20–24°C, though heat waves can push readings above 28°C. The Met Office's long-term records show June 6 historically averages around 19–20°C as a high, with extremes rarely exceeding 30°C. Comparable prediction markets on weather outcomes across Polymarket, Kalshi, Betfair, and Smarkets show divergent liquidity patterns: Polymarket's binary YES/NO structure often attracts larger positions on extreme outcomes, whilst Kalshi's regulated US-focused book typically concentrates volume on temperature ranges within one standard deviation of seasonal norms. Betfair's decimal odds format and Smarkets' commission structure (versus Polymarket's AMM spread) create different incentive structures for range-based bets, particularly when historical data suggests clustering around 20–23°C.

Traders should monitor the UK Met Office's seasonal forecasts released in May 2026 and any Atlantic weather patterns that might drive anomalous heat into southern England. The settlement window closes at noon UTC on 6 June, meaning morning temperatures will determine the outcome. Clarification on whether the market's range buckets align with standard meteorological intervals (e.g., 15–18°C, 18–21°C, 21–24°C) remains essential before significant capital commits.

Methodology

This page compares Highest temperature in London on June 6? specifically across Polymarket, Kalshi, Betfair Exchange and Smarkets. Live odds come from the Polymarket order book; the other venues' contract details are maintained manually because their APIs aren't directly comparable. Every CTA routes to Polymarket Alternative, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Settlement is the biggest difference between the four platforms: Polymarket on-chain in USDC (instant), Kalshi USD via CFTC (T+1), Betfair and Smarkets in local currency via bank withdrawal (T+1 to T+3). Polymarket Alternative routes every trade directly into Polymarket's on-chain settlement, which is why payouts land fastest.

FAQ

Where can I trade this market with the lowest fees?

On Polymarket Alternative, 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.

Is this market available outside the US?

Polymarket Alternative 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'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.

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, Polymarket Alternative 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.