Highest temperature in Milan on July 31?

Platform comparison

Market context

Milan’s hottest reading on 31 July will come from the Malpensa airport station, with the market settling on the *day’s maximum* recorded temperature rather than an end-of-day average. Late July is normally the warmest part of the Milan climate, with average July highs around 30°C to 31°C, but actual daily peaks can vary sharply with short-lived heat pulses, thunderstorms, and cloud cover.[10][14][16] The current crowd-implied 0% YES suggests the market is pricing in either a very narrow outcome band or a strong belief that the station will not print an unusually high maximum.

That framing is easier to read if you compare venue mechanics. On Polymarket, the displayed crowd probability is already in percentage form, while Kalshi and some exchange-style books more often surface decimal prices or contract values, so the same view can look less extreme there even when the underlying expectation is similar. Betfair and Smarkets usually add another layer through commission and lower-liquidity spread, which can make short-dated weather contracts look less certain than they are, especially when the final source is a single airport observation rather than a citywide average. For context, Milan has already seen extreme summer heat in 2026, including a reported 40°C on 30 July, which shows how quickly the upper tail can move in this season.[1]

The main catalysts are simple and meteorological: the local forecast for late-morning and early-afternoon heating, any passing convective cloud or rain, and whether wind shifts or maritime air suppress the peak before the market’s settlement cut-off. Since the resolution source is Wunderground’s Malpensa history page, traders should watch that station specifically rather than broader Milan forecasts, because airport conditions can diverge from the urban centre. If a heat plume persists into midday, the upper temperature band becomes more plausible; if cloud, showers, or a northerly change arrive early, the top reading can stay materially lower.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares Highest temperature in Milan on July 31? specifically across Polymarket, Kalshi, Betfair Exchange and Smarkets. The live probability is the Polymarket mid; the comparison columns summarise each venue's fee structure, KYC, settlement currency and payment rails. Every CTA routes to Polymarket Alternative, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Settlement is the biggest difference between the four platforms: Polymarket on-chain in USDC (instant), Kalshi USD via CFTC (T+1), Betfair and Smarkets in local currency via bank withdrawal (T+1 to T+3). On-chain settlement clears in minutes — the fastest payout path of the four.

FAQ

What does Polymarket cost vs Kalshi?

Polymarket: 0% fees, only Polygon network costs (~$0.01/trade). Kalshi: up to 7% per trade plus spread. For high-frequency traders, Polymarket is dramatically cheaper.

Which platform has the deepest liquidity?

Polymarket — by a wide margin. Top markets reach $50-500M volume, Kalshi ~$200M cumulative, Betfair similar. Deeper liquidity means your trade moves the quote less.

Is Betfair a Polymarket alternative?

Only partially. Betfair Exchange is UK-focused with a sports-betting emphasis; they have politics markets but with thinner liquidity than Polymarket. Settlement in GBP/EUR, 2-5% commission on winnings.

Which platform is accessible globally?

Polymarket is geo-blocked in the US/UK/EU. Kalshi is US-only. Betfair and Smarkets are UK-restricted. Polymarket Alternative has a different geo footprint and routes to Polymarket's order book at 0% fees.

Are all these platforms regulated?

No. Kalshi is CFTC-regulated (US). Betfair and Smarkets are UK Gambling Commission licensed. Polymarket operates without explicit regulation — a different risk profile than a regulated sportsbook.