Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via Prediction Today) Pick polygram.ink (preferred broker) |
32% | 68% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Live odds → |
Polymarket (direct) polymarket.com |
32% | 68% | 0% | Geo-blocked in US/UK/EU | USDC, on-chain | Live odds → |
Kalshi kalshi.com |
— | — | Up to 7% per trade | US-only, KYC required | USD | Live odds → |
Betfair Exchange betfair.com |
— | — | 2-5% commission | Full KYC from first trade | GBP / EUR | Live odds → |
Manifold Markets manifold.markets |
— | — | Play-money (mana) | None — play-money | Mana (no cash-out) | Live odds → |
Outcome probabilities
Current market-implied probability for each outcome, from the live order book.
| Outcome | Probability |
|---|---|
| 30°C | 32% |
| 31°C | 23% |
| 29°C | 22% |
| 32°C | 9% |
| 28°C | 7% |
| 27°C or below | 3% |
| 33°C | 2% |
| 34°C | 0% |
| 35°C | 0% |
| 36°C | 0% |
| 37°C or higher | 0% |
Market context
Milan's peak temperature on 17 August 2026 will be measured at Malpensa International Airport, with the crowd currently assigning just 4% probability to the highest threshold in this market's range. The settlement hinges on Weather Underground's Daily Observations table rather than summary figures, a distinction that matters when intraday readings spike above headline highs. August in northern Italy typically peaks between 28–32°C, though heat waves can push readings several degrees higher; the specific threshold this market tracks will determine whether current odds reflect realistic extremes or underestimate the tail risk of exceptional heat.
Historical August temperatures at Malpensa show the airport has recorded readings above 35°C roughly once per decade, with the most recent notable spike in 2023 when several days exceeded 34°C during a European heat event. The 4% probability suggests traders are pricing for a genuinely unusual outcome—well beyond Milan's typical summer maximum. This calibration makes sense given that sustained heat waves require specific atmospheric conditions: a blocking high-pressure system anchored over central Europe, suppressed Atlantic moisture, and minimal cloud cover during peak solar hours.
Monitoring European weather forecasts through mid-August will be critical, particularly any signals of a Saharan air mass advection northward or a persistent anticyclone establishing itself over the Mediterranean. Major meteorological services issue extended outlooks 10–14 days ahead; any shift toward anomalous heat patterns in late July could shift trader positioning materially. Current conditions and seasonal patterns suggest the crowd's scepticism is broadly grounded, though traders should watch for sudden forecast changes that could rapidly reprrice tail-risk scenarios.
Methodology
This page is a comparison snapshot: one live quote, four reference venues with their key attributes, and a single execution path — every trade button routes to Prediction Today, which mirrors the Polymarket order book directly.
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
- 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.
- 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%.
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