Highest temperature in Milan on July 15?

Platform comparison

Market context

On 15 July 2026, the Malpensa International Airport in Milan will record its highest daily temperature, a single real-world data point that determines how this prediction market settles. In prediction markets, a YES share pays out if the event occurs as defined, while a NO share pays out if it does not; here, the market is structured as a range bet where the outcome is the specific temperature bracket containing the day’s peak reading.

Historical climate data shows Milan’s average July high is 29°C, with rain occurring on roughly 18% of days and humidity averaging 58%, creating conditions that typically keep temperatures below 32°C [2]. Yet the current crowd-implied probability of 100% YES suggests traders are overwhelmingly confident the temperature will fall within the winning range, even though Polymarket data shows a competing market assigning only 50% probability to “32°C or below” and 33% to “33°C” [1]. This divergence highlights how different platforms can reflect varying collective views on the same weather event.

Traders should monitor real-time weather updates from Wunderground, the official resolution source, which publishes the highest temperature recorded for Malpensa Airport each day [1]. No formal announcements or schedules will alter the outcome, as the result depends solely on the observed temperature at the station. The settlement window closes at 12:00 UTC on 15 July 2026, after which the market resolves based on the final recorded figure.

Sources: 1 · 2

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

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

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 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.

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.

What does Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

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.