Highest temperature in Madrid on July 31?

Platform comparison

Market context

Madrid is in the middle of a late-July heat episode, with mainstream forecasts pointing to highs around the upper 30s Celsius and at least one Spanish outlet projecting 38°C for the city on 31 July. AccuWeather’s July pages for Madrid also place the day in a hot band, with forecast highs around 92–96°F, which is consistent with a mid-summer setup where airport readings can still run above 35°C but may sit a little below the city centre peak[1][4][5].

That makes the current 0% implied probability for a low range look hard to reconcile with recent Madrid climate behaviour. July averages in Madrid commonly sit around 31–33°C for daytime highs, but the city has repeatedly pushed well beyond 40°C in recent years, including 40.7°C at Madrid’s Retiro station on 14 July 2022, 14 August 2021 and 28 June 2019[7][11][15]. For an airport station reading to land in the top bands, sustained dry heat and strong insolation matter more than short-lived cloud cover; in practice, terminal-band outcomes become much more plausible whenever the wider regional forecast is already in the high 30s.

The main catalysts are the day’s final forecast updates, any last-minute shift in synoptic conditions, and the timing of peak heating before the settlement window closes at noon UTC. Traders should watch whether the hot spell is strengthened by a stable Iberian high, whether morning cloud or a breezier onshore flow trims the maximum, and whether the airport station tracks the city forecast closely or undercuts it by a degree or two. With no major scheduled event to change the weather itself, the key dependency is simply how the latest local forecast evolves against the observed temperatures through late morning.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Sports-specific comparison page for Highest temperature in Madrid on July 31?. Polymarket's live quote (Polygon order book) plus platform attributes for the three reference venues. Sports markets reward liquidity — Polymarket and Betfair are materially deeper than Kalshi or Manifold.

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