Highest temperature in Madrid on July 22?

Platform comparison

Market context

Madrid’s **highest temperature** today will be set by the reading at Adolfo Suárez Madrid-Barajas Airport, and the market is effectively asking where the day’s peak lands rather than whether the city stays hot. The crowd is already priced to a very specific outcome, with Polymarket showing **39°C** as the clear frontrunner at **77%**, while **40°C** sits next at **21%**; that spread suggests traders see a tightly clustered forecast around the upper 30s rather than a wide temperature distribution.[1]

For context, that pricing fits the broader July pattern in Madrid, where central Spain often sits in the high 30s and can push into the low 40s during heat episodes. A Spanish forecast published today put Madrid’s maximum at **39°C** with **0% rain**, which lines up with the market’s main bucket and leaves only a limited tail risk of an overshoot into 40°C or beyond.[2][4] On Kalshi, Betfair or Smarkets, the same event would usually be expressed differently: Kalshi-style markets quote direct probabilities, while exchange books show decimal odds that can be converted back to implied probability, with the final tradable price also shaped by commissions and spread.[5][6]

The main catalysts are short-horizon weather updates, not scheduled events: any change in afternoon heat, cloud cover, or wind can move the final airport reading by a degree either way. Because settlement is based on the day’s maximum recorded at the airport station, the key watchpoint is whether the official temperature peaks before the market’s cutoff and whether later updates confirm or revise the forecast; airport-specific observations can differ from city-centre conditions, which matters when the line is sitting on the 39°C/40°C boundary.[2][4]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares Highest temperature in Madrid on July 22? 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

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.

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.

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.

Which platform supports Klarna/SOFORT?

Directly: none. Polymarket accepts only USDC on Polygon. Kalshi Alternative UK 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.