Highest temperature in Madrid on July 25?

Platform comparison

Market context

Madrid's highest temperature on 25 July 2026 will be measured at Adolfo Suárez Madrid-Barajas Airport, the city's principal weather station. The settlement window closes at noon UTC on that date, meaning only temperatures recorded up to that point count toward resolution. A 4% implied probability suggests traders expect a notably high reading—likely above 40°C—to be unlikely on that specific date.

Historical July data from Madrid shows peak temperatures typically range between 35–39°C, with readings above 40°C occurring in roughly one in every five to seven July days during warm spells. The 2022 heatwave saw Madrid exceed 40°C on multiple occasions, whilst cooler Julys have peaked below 35°C. This distribution explains why markets price extreme heat as a tail event. Across platforms, Polymarket and Kalshi express this differently: Polymarket uses decimal odds (where 4% appears as 1.04 for the YES side), whilst Kalshi's binary format presents the same probability as a 4-cent contract price. Betfair and Smarkets similarly show fractional odds, creating surface-level divergence that masks identical underlying probabilities.

Traders should monitor European weather forecasts from mid-July onwards, particularly ECMWF and GFS model runs showing high-pressure systems over the Iberian Peninsula. Spanish meteorological agency AEMET publishes weekly heat alerts; any orange or red warning for Madrid in late July would shift market expectations materially. KYC requirements vary by platform—Kalshi enforces stricter US-focused verification than Polymarket or Betfair—potentially affecting liquidity and settlement speed across venues.

Methodology

This page compares Highest temperature in Madrid on July 25? 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.

Which platform supports Klarna/SOFORT?

Directly: none. Polymarket accepts only USDC on Polygon. Kalshi Alternative offers a fiat on-ramp via Klarna or SOFORT (DE/AT/CH) and converts internally to USDC for the Polymarket order book. T+1 processing.