Highest temperature in Madrid on July 24?

Platform comparison

Market context

Madrid’s highest temperature on 24 July will be measured at Barajas Airport, and the market settles on the *daily maximum* reported by Wunderground for that station. On Polymarket the crowd is currently clustering around **34°C** and **35°C**, which implies the market is pricing a hot but fairly ordinary summer peak rather than an extreme heatoutlier.[1]

That reading fits Madrid’s July climate, where average highs are typically in the low-to-mid 30s Celsius and rainfall is rare, so the main uncertainty is not whether it will be warm, but whether the day lands a degree or two above or below the seasonal norm.[4][5][6] In practice, that makes the market more sensitive to overnight warmth, afternoon sunshine, and any late-day convective cloud cover than to precipitation risk, which is usually minimal in Madrid in July.[4][5]

For platform comparison, Polymarket displays this as a probability ladder across temperature bands, while Betfair and Smarkets generally express the same view through decimal odds and a visible order book, making price moves easier to read but less directly comparable. Kalshi-style markets also tend to factor in fees differently from exchange books, and access/KYC rules can vary by platform, so a trader comparing venues on this event should check both the quoted price and the all-in cost of entering the position.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares Highest temperature in Madrid on July 24? 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 UK, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Polymarket settles via UMA Optimistic Oracle on Polygon. A proposer posts the outcome with a bond, the two-hour window runs, then the smart contract pays USDC.

Kalshi settles USD through the CFTC-regulated clearinghouse — the cleanest variant, with heavier KYC. Betfair Exchange settles in account currency (GBP/EUR), net of 2-5% commission. Smarkets follows the same model as Betfair with a lower default 2% commission.

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.

What about Smarkets as an alternative?

Smarkets is a UK betting exchange with a lower default commission (2%) than Betfair. Liquidity on political markets is below Polymarket, comparable to Kalshi. Geo-blocked in many jurisdictions.

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 UK 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.