Highest temperature in Miami on August 5?

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Market context

Miami International Airport is set for another very warm August afternoon, with local forecasts around 90°F and a small cluster of outcomes concentrated in the high 80s to low 90s rather than anything materially cooler. AccuWeather’s August outlook shows 5 August with a high near 89°F and 6 August near 89°F as well, while CBS News Miami said the day was expected to reach around 90°F. That sits comfortably in the market’s nearest bands and explains why the 0% implied chance on an outcome above the very top of the distribution is hard to justify on weather alone.[1][2]

For framing, Miami’s early-August climate is typically hot and humid, with daily highs often around the upper 80s to near 90°F, so the relevant comparison is not whether it gets hot, but whether it can push one or two degrees above consensus. The market is also sensitive to airport-specific effects: the settlement source is Miami Intl Airport Station, so a downtown or suburban reading would not matter if the airport itself runs a touch cooler or warmer. In practical terms, the historical range for this date supports a tight band around the forecast, making the exact peak temperature more important than the general feel of the day.[3][16]

Traders should watch the final National Weather Service and local station updates for any afternoon thunderstorm timing, sea-breeze interactions, or cloud cover changes that could shave the high by a degree or two. CBS News Miami’s forecast was already anchored at 90°F, so the main upside catalyst would be a cleaner, sunnier run through the hottest part of the day; the main downside catalyst would be earlier convection or heavier cloud cover. Because the market resolves off the highest observed temperature at the airport, even a brief spike matters, but only if it occurs before the daily maximum is locked in by the station report.[2][3][12]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Sports-specific comparison page for Highest temperature in Miami on August 5?. 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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