Highest temperature in Madrid on August 9?

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Market context

Madrid is in the middle of its August heat season, and the current 0% Yes price implies traders are treating the upside beyond the low 30s Celsius as remote. Forecasts already published for 9 August cluster around the upper 20s to upper 30s Celsius, with AccuWeather showing 97°F/69°F and Timeanddate showing 98°F/68°F, while the World Meteorological Organization’s Madrid page lists 24°C to 36°C for the day.[2][4][3] The market’s own description matters here: settlement depends on the highest reading in Weather Underground’s Daily Observations for Madrid-Barajas, not the summary high, so brief spikes around early afternoon or a late-afternoon re-acceleration are what can move the result.[13]

For context, Madrid’s August highs typically sit in the high 20s to low 30s Celsius, but hot spells regularly push above that range and can approach the high 30s.[8][10] Recent climate-monitor data for Madrid showed a 37.8°C maximum on 7 August and a forecast maximum of 35.3°C for the 9th, underlining that this is a live heat event rather than a capped seasonal average.[11] That makes the market’s 0% Yes reading easier to understand only if traders are anchoring to a much higher threshold than the forecast consensus; historically, Madrid airport readings in severe heat can exceed city-centre figures, but not by enough to make 0% a safe assumption.[15][18]

The main catalysts are the day’s actual station observations and any last-mile forecast updates from Spanish meteorological services or commercial forecasters before noon UTC, because the settlement window ends at 12:00 UTC and revisions to observations only matter until the first datapoint for the following date is published.[9] The key dependency is whether the airport station records a short-lived peak during peak heating hours, especially if skies stay clear and winds remain light, as indicated in the published forecasts.[2][4] If cloud cover, dust, or a wind shift limits mixing, the final observed maximum can land below forecast highs even on a very hot day.[3][11]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Sports-specific comparison page for Highest temperature in Madrid on August 9?. 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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