Highest temperature in Milan on July 21?

Platform comparison

Market context

Milan's highest temperature on 21 July 2026 will be measured at Malpensa International Airport and resolved against Wunderground's historical records. The market currently prices all temperature ranges at 0% YES across the board on Polygon, reflecting the settlement window's closure before any actual data exists. Traders are essentially pricing uncertainty itself—the conditional tokens here have no intrinsic value until the day passes and Wunderground records the daily maximum.

July in Milan typically peaks between 28–32°C, though heat waves can push readings above 35°C. Historical precedent matters here: the city recorded 37.3°C in August 2003 and 36.4°C in July 2022. The 0% probability across all ranges suggests the market hasn't yet attracted liquidity or conviction, a common state for weather contracts far from their settlement date. As July 2026 approaches, traders will calibrate positions based on seasonal forecasts, atmospheric patterns, and any anomalous weather systems developing across southern Europe.

The European Centre for Medium-Range Weather Forecasts (ECMWF) and Meteo-France typically issue reliable 10-day outlooks by mid-July, which will become the primary catalyst for repricing. Traders should monitor whether any heat dome or Atlantic blocking pattern develops in the weeks preceding settlement. Malpensa's location north of Milan's city centre means readings there often run 1–2°C cooler than central urban stations, a technical detail that affects which temperature bands accumulate trading volume once forecasts solidify.

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.

FAQ

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 PolyGram. 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.

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?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like PolyGram trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.

How reliable are the quoted odds?

The YES/NO percentages are the live mid-prices of the Polymarket order book. On deep markets they move every few seconds; on thinner ones you'll see short plateaus.