Highest temperature in Madrid on July 31?

Platform comparison

Market context

Madrid’s airport observation point is still being priced against the possibility of an unusually hot afternoon, but the market’s 0% Yes implies traders see little chance that the day’s top reading lands in the higher outcome bands. That fits the broader July climate profile for Madrid, where average daily highs sit in the low-to-mid 30s °C and extreme spikes are possible but not routine; WeatherSpark says July maxima in Madrid typically rise towards 33°C, with rare days above 37°C, while Wikipedia’s climate data records 40.7°C as the city’s modern benchmark extreme[7][11]. For a temperature market, that matters because a narrow band miss can flip the contract even when the day feels broadly hot. Wunderground’s airport-specific settlement source also makes the exact station relevant, since city-centre heat and airport readings can differ by a degree or more.

Recent forecasts have pointed to a very warm end-July setup in Madrid, with one Spanish report calling for a 38°C maximum on 31 July and AccuWeather showing late-month highs in the mid-30s to mid-90s Fahrenheit range, which is enough to keep upside risk alive even if the crowd is not pricing it in[4][2]. For platform comparison, Polymarket typically displays a direct implied probability, while Kalshi and Betfair/Smarkets style books express the same view through prices or decimal odds, so a 0% screen can mask small but non-zero bids if liquidity is thin. Fees and access also differ: exchange-style books usually charge commissions or maker-taker style costs and require full KYC in more jurisdictions, whereas access on prediction platforms can vary by region.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares Highest temperature in Madrid 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 Kalshi 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

Polymarket vs Kalshi — which is better?

Depends on your location. Kalshi is CFTC-regulated, US-only with full KYC. Polymarket is global, on-chain, no KYC up to $1,500. Polymarket has ~10x higher liquidity but higher regulatory risk.

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. Kalshi 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.