Highest temperature in London on June 14?

Platform comparison

Active sub-markets

Market context

On 14 June 2026, the highest temperature recorded at London City Airport will settle this market into one of several temperature bands. The settlement relies on historical data from Weather Underground's daily records for that specific station, which sits in East London and typically records slightly warmer readings than central London due to its location near the Thames estuary. The 0% crowd probability suggests traders are either uncertain about the resolution mechanics or treating this as a placeholder market awaiting liquidity.

London's June temperatures have historically ranged between 18°C and 28°C, with average highs around 22–23°C. The Met Office's 30-year climate normals show that temperatures exceeding 25°C occur in roughly 40% of June days, whilst readings above 28°C remain relatively uncommon but not unprecedented. The 2022 heatwave pushed London to 40.3°C in July, demonstrating how extreme outliers can skew expectations; however, June typically sits well below such thresholds. Cross-platform comparison reveals that Kalshi's weather markets often attract more conservative pricing than Betfair's, partly because Kalshi's regulatory framework in the US limits international participation, whereas Smarkets and Betfair draw broader European liquidity on UK-specific weather events.

Traders should monitor the UK Met Office's medium-range forecasts released in early June, which typically gain accuracy within 10 days of the event. The North Atlantic Oscillation and jet stream positioning in mid-June will be critical catalysts; a southward-dipping jet could draw warm continental air northward, whilst a northerly pattern would suppress temperatures. Polymarket's decimal odds format and lower fees (relative to Betfair's 5% commission) may attract arbitrage activity once forecasts solidify, though KYC restrictions limit its reach compared to Smarkets' more open onboarding.

Methodology

This page compares Highest temperature in London on June 14? 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 Kalshi Alternative UK, 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). Kalshi Alternative UK 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 Kalshi Alternative 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.

Is this market available outside the US?

Kalshi Alternative 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'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 Kalshi Alternative UK?

Zero. Kalshi Alternative 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.