Highest temperature in London on June 10?

Platform comparison

Active sub-markets

Market context

On 10 June 2026, the highest temperature recorded at London City Airport will determine which range this market settles into. The settlement source is Wunderground's historical weather data for that specific station, with resolution occurring at midday on the day itself. Traders selecting this market should note that Polymarket and Kalshi both offer temperature prediction markets, though Kalshi's weather category typically settles faster and carries lower fees (around 2% versus Polymarket's variable structure). Betfair and Smarkets, by contrast, rarely offer granular single-day temperature markets, focusing instead on seasonal or weekly aggregates, making direct comparison difficult on this particular contract.

London's June temperatures have historically ranged between 18°C and 28°C, with the 30-year average high around 22°C. The 0% implied probability currently shown suggests either extreme confidence in a specific range or minimal liquidity; this divergence between platforms is common for niche weather contracts. Kalshi's decimal odds format and KYC requirements (US residents primarily) may explain lower participation compared to Betfair's international reach, though neither platform currently shows active depth on this exact market.

Traders should monitor the Met Office's 10-day forecast as June approaches; any heatwave warnings or Atlantic high-pressure systems would shift probability significantly. Recent spring patterns (2024–2025) showed increased volatility in UK temperature predictions beyond five days out, reducing forecast reliability and potentially explaining thin order books across all platforms.

Methodology

This page compares Highest temperature in London on June 10? 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

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.

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, Kalshi Alternative UK triggers a quick verification flow that finishes in minutes.