Highest temperature in Milan on August 20?

Platform comparison

Market context

On 20 August 2026, the highest temperature recorded at Milan Malpensa International Airport will fall into one of several predefined ranges. The market resolves using the Daily Observations table from Weather Underground rather than the summary Day High & Low figure, a distinction that matters when automated systems pull data; the two sources occasionally diverge by a degree or two, particularly during rapid temperature swings in late afternoon. Settlement occurs at 12:00 UTC, meaning the full calendar day's observations are captured before resolution.

August temperatures at Malpensa historically cluster between 24–28°C, with extremes reaching 32–33°C during heat waves. The 0% crowd probability suggests traders are either absent from this market or treating it as a placeholder pending clearer range definitions. Comparable August days at the station show that temperatures exceeding 30°C occur roughly once every three to four years; the 2023 European heat dome pushed Milan to 34°C, though such events remain outliers rather than the norm.

Traders monitoring this market should track European weather forecasting updates from Météo-France and ECMWF, particularly any heat-dome warnings issued in early August 2026. Programmatic approaches would benefit from integrating live Wunderground API pulls starting mid-August to establish intraday volatility patterns; conditional orders tied to European heat alerts could automate position adjustments. The specificity of the resolution source—Daily Observations over summary tables—makes direct API verification essential for any bot-driven strategy, as manual Weather Underground checks will be insufficient for confident settlement prediction.

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

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 Polymarket Review UK. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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.

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%.