Highest temperature in Milan on August 17?

Platform comparison

Market context

On 17 August 2026, the highest temperature recorded at Milan's Malpensa International Airport will fall into one of several defined ranges. A YES share in this market pays out if the day's peak temperature lands in the specific bracket listed in the market title; a NO share pays out if it falls outside that range. The resolution hinges on data from Weather Underground's Daily Observations table—the granular, station-level readings rather than rounded summary figures—making precision in source selection critical to settlement.

Milan's August temperatures typically peak between 28 and 32 degrees Celsius, with extremes occasionally reaching 35 degrees or higher during heat waves. Historical August records show considerable year-to-year variation; the city experienced 37.3 degrees in August 2003 during Europe's severe heat event, whilst cooler Augusts have seen highs around 26 degrees. The current 4% implied probability suggests the market is pricing in a relatively narrow or extreme temperature band. Traders assessing likelihood should examine what threshold the YES range represents and compare it against climatological norms for northern Italy in mid-August.

European summer weather patterns in 2026 will depend on Atlantic pressure systems and any developing heat domes across the continent. The UK Met Office and European Centre for Medium-Range Weather Forecasts typically issue reliable forecasts 10–14 days ahead; traders should monitor these outlets from early August for signals of anomalous heat or cooler conditions. Localised factors—urban heat island effects at Malpensa, nearby lake influences—also shape daily maxima, though broad continental patterns remain the dominant driver of August temperatures in Lombardy.

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

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

UK Frequently Asked Questions

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.

How does resolution work?

Through the UMA Optimistic Oracle on Polygon: a proposer submits the outcome, a two-hour challenge window opens, and USDC payouts settle automatically once the result is final.

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%.