Highest temperature in London on August 16?

Platform comparison

Market context

On 16 August 2026, the highest temperature recorded at London City Airport will fall into one of several defined ranges. In prediction markets, traders buy YES shares if they believe the outcome will occur, or NO shares if they expect it won't. The price of each share reflects the crowd's collective estimate of that likelihood. Here, the 0% probability suggests the market crowd currently views a particular temperature threshold as extremely unlikely—though the specific threshold isn't stated in the market description provided. Resolution will depend on the Daily Observations table from Weather Underground rather than summary figures, a distinction that matters because intraday readings can occasionally diverge from headline highs.

London's August climate typically produces daytime highs between 20–24°C, with occasional peaks above 25°C during heat waves. Historical August records at or near London City Airport show that temperatures exceeding 30°C are rare but not unprecedented; the UK's August average has drifted upward over recent decades. The 0% crowd probability suggests traders expect the market's threshold to sit well outside normal August conditions—possibly 35°C or higher—making it a tail-risk bet rather than a mainstream weather forecast.

Traders monitoring this market should track Met Office forecasts released in the days before 16 August, particularly any heat-wave alerts or anomalous pressure systems. Seasonal patterns matter: if August 2026 develops an Atlantic blocking high, continental air masses could push temperatures sharply upward. The settlement window closes at midday on the day itself, so morning forecasts will be the final catalyst before resolution locks in.

Methodology

This page reviews Highest temperature in London on August 16? across five venues. The live probability is the Polymarket mid-price, sourced directly from the on-chain Polygon order book; the comparison columns benchmark each venue on fee structure, KYC, settlement currency and payment rails. Every CTA routes to Prediction Market UK, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

UK Frequently Asked Questions

Where can I trade this market with the lowest fees?

Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is Prediction Market UK. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

Is this market available outside the US?

Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

Is Polymarket legal in the UK?

Polymarket is accessible to UK traders but is not UKGC-licensed. It operates under US CFTC jurisdiction. UK residents face no domestic legal prohibition on using it, but UKGC consumer protections do not apply. For UKGC-regulated alternatives, Betfair Exchange and Smarkets offer similar prediction-style markets.

Do I pay tax on prediction market profits in the UK?

UKGC-licensed platform profits (Betfair, Smarkets) are typically tax-free gambling winnings for UK individuals. Polymarket profits involve USDC crypto transactions, which HMRC treats as Capital Gains Tax events. Keep full transaction records and report via Self Assessment if gains exceed £3,000 per tax year.

How do I deposit on Polymarket from the UK?

UK traders typically fund Polymarket via Coinbase UK, Kraken or Revolut — buying USDC with GBP and transferring to a Polygon-compatible wallet (MetaMask, Coinbase Wallet). Polymarket's onboarding walks you through the bridging process. Typical GBP-to-USDC conversion costs 0.5–1%.